I did my politics A level last year and I was failing for the whole 2 years. I even dropped the subject 3 months before my exam because my teachers and I thought it wasn’t even worth taking. A couple weeks before the exam I decided to give it a go and instead of trying to learn all of the content to get me an A*, I just learnt the basics as well as I could. In the end I managed to get an A without knowing more than 10 case studies for each paper or wasting my time trying to remember every single detail of every topic. You have plenty of time I promise you, most people in my classes ended up revising most of the content the week of the exam!