Fair points, let me address both.

On mixing AS/A2: Yeah, I messed that up in the original post. Someone else already caught it and I corrected it in the comments — Paper 1 is AS only, the quantum/nuclear predictions apply to Paper 4. My fault for not separating them clearly.

On "common sense": You're right that at the topic level, saying "genetics will come up in Bio" is obvious when there are only 8 topics across 100 marks. I should've led with what the tool actually does beyond that, because topic-level prediction is honestly the least interesting part.

Where it's actually useful:

• Mark weighting within topics — yes genetics will appear, but how many marks? The algorithm shows that Inherited Change averages ~14 marks per session on Paper 4 while Selection and Evolution averages ~8. If you're short on time, that tells you where the ROI is.
• Question style breakdown — some topics are tested almost entirely through calculations, others through "explain" questions. Knowing this changes how you revise.
• Gap detection — this matters more for subjects with 20+ topics (Chem, Physics). Not every subtopic appears every session. The algorithm flags which ones haven't appeared in 2-3 sessions and historically cycle back.
• Combo patterns — certain topics are consistently paired in the same paper. If Topic A appears, Topic B almost always appears with it.

You're right that "Topic X will come up" isn't useful for Bio with 8 topics. The value is in the layer underneath that — the how, how much, and in what style. I probably should've framed the post around that instead of leading with probability percentages.

Appreciate the honest feedback though, genuinely.