NSAA prep - which sections trip up Cambridge Natural Sciences applicants the most?
I'm applying to Cambridge Natural Sciences next cycle and just started seriously prepping for the NSAA. I'm doing A-level Biology, Chemistry, and Maths and thought I'd be fine, but Section 1 is genuinely catching me off guard. The problem solving and scientific reasoning questions are different from anything you practice in class.
I've been working through the 2019-2023 past papers and my Section 1 scores are all over the place - anywhere from 58% to 74% depending on the day. Section 2 feels more predictable because it maps directly to A-level content, though the questions are harder versions of what you'd see on a paper. I'm spending about 90 minutes a day on this for the past 6 weeks.
The timing is brutal on Section 1 - 2 minutes per question sounds fine until you hit the multi-step data interpretation ones. I'm probably leaving 4-5 questions unanswered on every timed run which I know is killing my score. Has anyone found a good strategy for the time pressure specifically?
I sat it last October and Section 1 Problem Solving was harder than I expected while Section 2 Chemistry was fair. Scored around 70 overall which got me to interview. Consistent past paper practice under timed conditions is the main thing.
Don't underestimate Section 2 if your A-level teachers have been teaching to the exam. The NSAA wants you to apply concepts, not recall them. I got caught out on the chemistry section thinking it would be straightforward and it wasn't.
For timing on Section 1 - mark and move. If a question is taking more than 2.5 minutes, guess and flag it. I went back and got 3 of my flagged ones right at the end and finished with 4 minutes spare after adjusting my strategy.
Section 1 is the one that separates people. I prepped for 8 weeks mostly on past papers and improved my S1 score from about 60% to 78% by drilling the data analysis question types specifically. The biology content in S2 was actually the easier part for me.
Honestly Section 1 Part B (the scientific reasoning stuff) tripped me up way more than Part A at first. What helped me most wasn't just checking which answer was right, it was going back and figuring out exactly why each wrong answer was wrong. Like, sometimes two options look almost identical and the difference is really subtle, so if you don't understand why B is wrong and not just why C is right, you'll keep falling for the same trap on the next question.
The maths in Part A wasn't as bad as I expected once I stopped second-guessing myself and just worked through things systematically, but I'd say the biology-adjacent reasoning questions in Part B are where most people lose points without realising it. If you've got past papers, don't just time yourself through them, actually sit with the wrong ones afterwards. It feels slow but it's genuinely the fastest way to improve.
Failed my first attempt and honestly it was a wake-up call. I'd been treating it like a normal science exam and just reviewing content, but that's not what trips you up. Section 1 is the killer because it's not about what you know, it's about how fast you can think under pressure. The maths questions look simple but there's always a catch, and I kept second-guessing myself and running out of time.
Second time around I stopped doing content review and just drilled past papers obsessively, timing every single question. What actually helped was forcing myself to move on if I'd spent more than 90 seconds on something, then come back. You get way more marks finishing the paper than perfecting one question. Section 2 wasn't my issue but I know plenty of people who found the biology and chemistry harder than expected because the questions are weirdly applied, not textbook. Just do the past papers. Seriously, that's it.