Hmm.. dilemma.
Let me help you choose not to repeat with this scenario:
To get over 45 in Biology, you'll need to do at least 25 prac exams per unit
To get over 45 in Chem, you'll need to do at least 25 prac exams per unit
To get over 40 in Spec, you'll need to do at least 20 exam 1s and 20 exam 2s
To get over 40 in English, you're looking at 10-15 essays per book, and 10 media essays
To get 5.5 in unimaths, you're looking at every practise exam you can get a hold of as well as copious other amounts of work
That's already well over a couple hundred hours of work of revision. Do you really want to pile methods onto that?
You didn't do terribly, just say "okay that's my 7th subject!", smile, and get on with it.