I mean i'm not doing A level history but I am doing it for GCSE and i mean i'm pretty sure these tips are useful anyway. Something I do is to make a huge timeline for the topic with my highlighters and coloured pens (just make the dates and event names stand out)and I stick it up and read it every morning, really helps with dates and making your writing flow - in terms of events, as you'll be confident in what happened when. Also, i would say invest in a good history book for content, ask your teachers where you can get them and which one to get. After learning the content, exam questions! and get your teacher to mark them and give feedback! I hope these are useful, and could you just in return give me an overview of your experience with history A levels