When’s the best time to finish all a level content

my teachers are very useless as i know for sure they aren’t finishing content with enough time for past papers and revising before the real a levels , s I decided to just take it into my own hands and finish content by end of February latest .
The problem is should i learn the content quickly and then bang out past papers and exam questions by topic or should i stop every few topics to do exam questions so i don’t forget all the stuff I’m rushing into my brain