I am a 4th year student at Lancaster University, so thought I might chime in and offer some advice.
I remember back at GCSE level, my teachers would mark us lower on mocks in case the grade boundaries were high for the actual exams. This might explain why you have received lower grades than you're used to.
Some of my favourite revision tips are:
-Try blurting; this is where you close all of your notes and from memory, write down everything you can remember about a topic. Once you're finished, open your notes back up and mark what you've written. This is a good way of showing what you are already good at and what you particularly need to focus on.
-Remember to take breaks! Your brain can only work so hard, to learn as effectively as possible, make sure you give yourself enough time to relax and refuel with food to keep yourself going!
-Past papers are your best friends. Past papers are a great way to know if you understand something, and also allow you to figure out what the examiners are looking for.
-Get yourself the CGP workbooks, they are amazing. I genuinely think the reason why I got good grades in Science GCSE was down to me religiously using those books.
Hope this helps, if you need any more help, just let us know.
Tyler (LU Student Ambassador)