Westminster Sixth Form Entrance Exams for Sept 2020 Watch
Didn’t really have your same subjects (except for maths), but here’s some info on the general process.
For maths the exam is alright, for the most part. It gets harder at the end, and the questions are like those from the Westminster Challenge.
Exam day is stressful, but interview day is AMAZING. The only kind of stressful thing is the TSA, but it’s fine so don’t worry too much about it.
The interviewers are all really nice, and it’s a generally really nice day because you get to see the school from the inside.