A level biology is tough! If you're going into y12 in September I would recommend consolidating your notes and starting revision early, it will definitely make it easier in the long term. I know how hard it is to try and revise everything at once! But honestly don't stress too much and doing a little bit a few times a week will make it much easier, plus your teachers will be there to offer lots of help and guidance. I did AQA so I don't know what the practicals are like for Edexcel but they were really good. Hope this helps.