Two Cambridge IGCSE schools can both say they "teach the sciences" and mean genuinely different things. Some run Combined Science, a single qualification covering Physics, Chemistry, and Biology at a reduced depth. Others teach the three as fully separate IGCSE subjects, each at full depth with its own grade. A test series built for one doesn't fit the other, and knowing which applies to your child changes how prep should actually be structured.

How Combined Science and Separate Sciences genuinely differ

Combined Science compresses all three subjects into two IGCSE grades, at a depth shallower than the full separate syllabus for each. Separate Sciences — Physics, Chemistry, and Biology taken individually — cover more content per subject and result in three full, independent grades. A student in Combined Science doesn't need Separate-Sciences-depth practice in every topic; a Separate Sciences student needs genuine full-depth coverage across all three, tested individually.

A common mistake: using the wrong depth of practice material

  • A Combined Science student drilling with Separate Sciences-level past papers can end up over-preparing on content that isn't actually examined at their depth, wasting time that should go elsewhere.
  • A Separate Sciences student practicing with Combined Science-level material risks under-preparing for the additional depth their actual exam requires.
  • Mixing the two without checking which syllabus a school actually follows is a common, avoidable source of wasted mock-test time.

Why matching the pack to the syllabus matters

A test series pack that matches the exact syllabus — Combined Science as its own two-grade qualification, or Physics, Chemistry, and Biology as three separate full subjects — ensures every mock paper is actually testing the depth and format a student will meet in their real exam session, rather than a close approximation that misses in either direction.

What this looks like in practice

BuzzyBrains Academy's IGCSE Cambridge Test Series offers both a Maths + Combined Science pack and a full Science Trio pack for Physics, Chemistry, and Biology taken separately — built around each syllabus's actual depth and structure, not a one-size-fits-all science paper.

If you're not certain which syllabus your child's school follows, the IGCSE Cambridge Test Series page lists both options clearly, or you can confirm the exact syllabus code with us on WhatsApp before choosing a pack.