Hello! I am a Math Comp student. I got 43 for my IB which is equivalent to 3 A*s I believe. I think UCL is realistic on entry standards given reasonable personal statement and reference letter. The increased requirement is due to the unexpected increased number of students enrolling last year.
I applied to Oxford and Imperial, and they had tests/interviews and additional documents as additional filters. UCL primarily uses grades to filter students. None of the Math Comp student from my year was asked to do an interview. UCL is more lenient with students without much CS background I believe (I did not do CS in IB), but MOST of my coursemates have done computing in A-level or have had programming background, so you know what you should do in your PS if you are not doing CS at A-level
Offers SHOULD be the same (A*A*A) as the entry requirement (I had an offer of 39, 19+ for HLs, which was the standard back then).
Out of my 5 UCAS choices, UCL was the latest to reply, and it took place at around May or April I believe.
Also this could be irrelevant to the application process, but I believe it is worth a thought before you finalize your application choice
1. Math Comp/ CS/ Math
There are many doubts and regrets (but mostly appreciation) for us Math Comp students on our choice of programme. And let's break it down for you to get a better picture:
-If you genuinely love to code and to build amazing softwares/codes, you should do straight CS as Math Comp lacks the "technical"/"applied" element. We spend up to 50% of our time with the Math department, and most of the rest doing the theoretical side of CS. Definitely not the best path leading to a software engineer career.
-If you only want to do the theoretical side of CS, do Maths (haha). First off, the teaching quality differs A LOT between the two dept (guess which one is better
) You can easily pick up CS concepts if you are well-trained under the math-dept (that is why many researchers did a math bachelor). Plus you actually do decent programming in the maths programme.
-Math Comp is somewhere between the two. They have restructured the programme this year and it looks much better. At upper years, we have a lot of flexibility to do the "applied" or the "theory" or just dig insanely deep into a specific field. Go Math Comp if you want a solid training under both aspects (rather than fields as they overlap a lot).
Good luck with your applications (and good luck to others who could potentially be reading this)