Though you aren't doing formal exams in June, I wanted to suggest this free online course from the BBC that will take you through some exercises on being a better academic writer as you move, hopefully, to your Level 3 courses at college in September. I'd highly recommend it to anyone who is doing written subjects at A Level or who will have assignment work for BTEC - plus, it'll really help push up your grade potential and keep you occupied over the break.
Hope this helps!
Lindsey