How to avoid (and stop) procrastinating?

Is there a reason that you can't get started with your work? Some people struggle because they're scared to get things wrong etc, so maybe there's something internal you need to acknowledge and mull over? If not, I don't think there's a particular answer or trick other than keep trying. If you start work and then get distracted 5 minutes in, realise you've gotten distracted and force yourself to work. You might repeat that a dozen times in a session, but it will improve over time.

Motivation is unreliable, you have to just build the habit and willpower to do sometimes boring things! That skill alone will serve you well in life.

Honestly I just can't be bothered, I'm very tired all the time and I often think I need to rest but at the same time it makes me feel worse because I know I need to get the grades this year

whats not good/bad?

Its relevant because of how realistic change is I mean are we talking Us and Es for grades previously or is it Bs/Cs but you think you can hit A*s etc?

because going from an E to an A is bigger then going from B to A* etc

I got BCC in my exams in August, which I guess isn't too bad but it was a big blow to my confidence. Realistically, to get into my preferred unis I would only need to increase by a grade for each subject (to ABB). It still feels like a long way to go for me though.