My tips:
Ask questions if you don't understand - even if all your classmates understand and you don't.
Do as many practice past papers as you can.
Try to do more than what your teacher has set.
Never leave it to the last minute (Maths is possibly the worst thing to leave to the last minute)
This is correct because if you are doing 4U maths, you don't do any 2U content or exams- making 3U/4U count as 2 units each. (I think BOS assumes you are a band 6 student in 2U)
You must be really tired ahaha
Weekend HW for me:
English Advanced poetry analysis
Math Ext. exercises
Physics (relative velocity revision)
Chemistry syllabus notes
D&T design portfolio
Geography syllabus notes, exercises
Work for every subject :(