i'm in a similar position to you, im currently studying for my resits as i type, making clear revision notes this time so when it comes to the resits i'll only need to revise lightly as the information will already be stored in my mind.
I spazzed out during As so there's no way i'll be able to do A2's which are harder, stress out about Uni's and revise for my resits which will make or break me all at the same time (i have pretty high standards and its AAB or nothing)
People say that you'll forget info but i think thats lies, depends how you revise and i'd rather not have spazz attack part two this year again.
I have had loads of free time this summer so i've had alot of time to figure out what revision techniques work for me