Secondary science is one subject for two years, then a decision, then two more years of something quite different. Sec 1 and Sec 2 follow the MOE lower-secondary science syllabus as a single combined subject, taught at Arche as its own class. At the end of Sec 2 your child chooses a subject combination, and from Sec 3 science splits into the pure sciences and Combined Science. Every class is capped at five students, in Hougang.

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How secondary science is structured

Parents are often surprised by how sharply science changes shape partway through secondary school. It is worth understanding the whole path before deciding what your child needs.

Sec 1 and Sec 2 — one subject. Science is taught as a single subject covering physics, chemistry and biology together, built around a handful of big themes: diversity, models, interactions and systems, alongside the practices of science itself. There is no split yet, and no national exam in sight.

End of Sec 2 — the decision. Schools run a subject options exercise, usually in Term 4 after the year-end results. Your child chooses a subject combination, and that combination determines which sciences they take for the next two years. Places are not unlimited and eligibility depends on Sec 2 results and school criteria, which differ from school to school.

Sec 3 and Sec 4 — pure or combined. Science splits into the pure sciences — Physics, Chemistry and Biology, each a full subject in its own right — and Combined Science, which pairs two of the three into a single subject. This is where national-examination preparation begins.

Sec 1 and Sec 2 science tuition

Lower-secondary science is where a child either learns to think like a scientist or learns to memorise. The difference does not show up in Sec 1 marks. It shows up in Sec 3, when the volume of content triples and memorising stops working.

At Arche, Sec 1 and Sec 2 science is taught as its own class, to the MOE lower-secondary syllabus, and not as early exam preparation. The syllabus is deliberately built around models and systems rather than facts — the particulate model of matter, the ray model of light, transfer of energy, cells, ecosystems — and each of those is an idea a student either genuinely understands or quietly works around.

Two years later that same student has to choose a subject combination that shapes their options for JC, polytechnic and beyond. A child who has understood lower-secondary science chooses from a position of strength. A child who has been coping chooses from a position of avoidance. That decision is the reason lower secondary matters, and it is the reason we teach it as its own thing.

For what those two years actually contain, see the sixteen topics in the lower secondary science syllabus, and why MOE publishes no official split between Sec 1 and Sec 2.

Coming to us from primary school? See PSLE Science tuition.

Pure Science or Combined Science: the Sec 2 decision

This is the question we are asked most often, and the honest answer is that it depends on where your child is heading, not on which is “better”.

Pure sciences. Physics, Chemistry and Biology each taken as a full separate subject, examined at the O-Level in 2026 as syllabuses 6091, 6092 and 6093, and at G3 under the new SEC from 2027 as K323, K324 and K325. Each has three papers: a one-hour multiple-choice paper, a one-hour-forty-five structured and free-response paper, and a practical examination. More depth, more time on the timetable, and generally the expected route for a student aiming at H2 sciences in JC.

Combined Science. Two of the three sciences paired into a single subject. All three pairings exist — Physics with Chemistry, Physics with Biology, and Chemistry with Biology — and each has its own syllabus code. A Combined Science student sits four papers: a shared multiple-choice paper, one structured paper for each of their two sciences, and a practical test covering both. It frees a slot on the timetable for another subject, which is often the real reason a school recommends it.

Neither choice closes off science. Both are respectable, and a student who does well in Combined Science is in a stronger position than one who struggles through Pure. What matters is matching the choice to the child.

One point worth knowing about the new SEC: at G2 level the sciences are offered only as combined pairings — the pure sciences appear at G3. If your child is being banded at G2 for science, Combined Science is the path, and the question becomes which pairing.

Which combination is your child taking?

Physics with Chemistry suits students who are comfortable with mathematics and calculation, and it is the more commonly offered pairing across centres. Chemistry with Biology suits students who reason well in words and systems rather than equations, and it is the pairing more often taken by students heading towards the life sciences and health-related courses. Physics with Biology is the least common of the three.

Arche teaches both the Physics/Chemistry and the Chemistry/Biology combinations. Parents in the Hougang area tell us Chemistry/Biology is the harder one to find locally, and it is the one we are asked for most often.

O-Level Combined Science tuition →

Sec 3 and Sec 4 science tuition

From Sec 3, teaching turns to the national examination. We run classes in each of the three pure sciences and in Combined Science.

• O-Level Physics tuition — measurement, Newtonian mechanics, thermal physics, waves, electricity and magnetism, radioactivity.
• O-Level Chemistry tuition — matter and its structures and properties, chemical reactions, and chemistry in a sustainable world.
• O-Level Biology tuition — cells and the chemistry of life, the human body, living things and ecosystems, and continuity of life.
• O-Level Combined Science tuition — both the Physics/Chemistry and Chemistry/Biology pairings.

Students sitting their national examinations from 2027 onwards will take the Singapore-Cambridge Secondary Education Certificate rather than the O-Level, at G1, G2 or G3 subject levels under Full Subject-Based Banding. For the sciences the assessment structure is unchanged — same papers, same durations, same weightings — but the certificate, the subject codes and the banding are new. Read our full explainer on the 2027 SEC and Full Subject-Based Banding.

The practical paper

Both routes are assessed partly by a practical examination, and it is the component students most often neglect.

For the pure sciences it is Paper 3, worth 20% of the subject. For Combined Science it is Paper 5, worth 15%, with questions on each of the two sciences. That is a meaningful slice of the grade decided by whether a student can plan an experiment, record observations properly, and draw a defensible conclusion — skills that are not improved by re-reading notes.

Why parents choose Arche for secondary science

Five students. Not six, not twelve. Every class is capped at five. In science that cap matters more than in most subjects, because the marks are lost in explanation and in method — a vague answer, a missing unit, a conclusion the data does not support. Those are visible in a class of five and invisible in a class of twenty.

Both Combined Science pairings, taught properly. Chemistry with Biology is not an afterthought here.

Aligned to your child’s school. Schools sequence the science syllabus differently. Lessons follow what your child’s school is actually teaching, so tuition supports the class rather than competing with it.

You can see what happened in the lesson. Every family gets a private parent dashboard with homework tracking and lesson-by-lesson notes.

Who this class is for

• The Sec 1 or Sec 2 student who is memorising. Marks are fine now. They will not be in Sec 3.
• The Sec 2 facing the subject options exercise. The decision is made once, in Term 4, and it shapes the next two years.
• The Sec 3 who has just met the split. Pure or combined, Sec 3 science is a genuine step up in volume and precision.
• The Sec 4 with a target grade. We will be honest with you about what a year can do.

Questions parents ask

Do you teach lower secondary science, or only O-Level?

Both, as separate classes. Sec 1 and Sec 2 follow the MOE lower-secondary science syllabus and are taught in their own class. From Sec 3 we teach the pure sciences and Combined Science separately. We do not put a Sec 1 student into an exam-preparation class.

What is the difference between Pure Science and Combined Science?

Pure sciences are Physics, Chemistry and Biology taken as three full separate subjects, each with three papers including a practical. Combined Science pairs two of the three into one subject with four papers, including a practical test covering both. Pure goes deeper and takes more timetable; combined frees a slot for another subject. Both are legitimate routes.

Which Combined Science combinations do you teach?

Physics with Chemistry, and Chemistry with Biology. All three pairings exist nationally — the third is Physics with Biology — and Chemistry with Biology is the one parents in this area most often tell us is hard to find.

When does my child choose their subject combination?

During Secondary 2, in a subject options exercise usually run in Term 4 after the year-end results, taking effect in Sec 3. Eligibility and places depend on your child’s results and your school’s own criteria, which vary between schools — ask your child’s school for their specific requirements rather than relying on a general rule.

Does Combined Science close off JC or the sciences?

No. It is a different route, not a lesser one, and doing well in Combined Science puts a student in a better position than struggling through Pure. Requirements for specific JC subject combinations and polytechnic courses do vary, so check the ones your child is actually aiming at.

Is there still a practical examination?

Yes. The pure sciences are assessed by a practical paper worth 20% of the subject, and Combined Science by a practical test worth 15% covering both of its sciences.

How big are your secondary science classes?

Five students, maximum. Every class, every level.

Can my child join partway through the school year?

Yes. We find out where your child actually is, identify the gaps, and align lessons to their school’s current position in the syllabus.

Where we are

Arche Academy
208 Hougang Street 21, #04-215, Singapore 530208
+65 9678 7010

We are in Hougang, within easy reach of Kovan, Serangoon, Sengkang and Punggol. Students come to us from North Vista, Holy Innocents’ High, Hougang Secondary, Xinmin, Yuying, Peicai, St Gabriel’s and St Andrew’s.

Book a trial lesson

Come and sit in on a class before you decide anything. You will see how your child is taught, meet the tutor, and get an honest assessment of where the gaps are — including, if it is the case, that your child does not need tuition right now.

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