Hey I do edexcel A level geography too. I think the most important thing is the case studies. Physics and maths tutor have a great section on case studies and you could also look at "A level geography revision:edexcel". Physics and maths tutor also have some good notes which it is helpful to print off and highlight.Try to stick to the advanced information for case studies and in general. If you were aiming for a B for example you would need 60% so try not to worry about missing something as long as you have tried your best that's all that counts. Its definitely not too late if you just do a little bit each day.Good luck but I'm sure you don't need it.