Hi there,
I am a Law Conversion Ccourse student with BPP. My formatives were difficult, so I knew for a fact that I needed to work harder for my summatives. Having fared well in both of my summatives, I think my main advice for MCQs would be to create flashcards that will help you remember your notes better.
My tutor also asked us to focus more on the textbook material and not just on the practice MCQs. If you know the text well, you will definitely fare better than others. Also, the hub in BPP has mock MCQs, and they are similar to the assessment questions that we answer.
Hope that helps,
Upama