how to revise for as-level history

how can i cram 2 units of a level history in 2 weeks? (i have one month until exams i just want time to do past papers)

i already started making flash cards but im nowhere near finished and it takes so long to make them bc i go into too much detail. am i better off making A3 summary mind maps instead bc we’re so close to exams or should i keep going with flash cards?

exam technique isn’t an issue it’s just the content atp