Personally I’d recommend taking your time if you can afford it. I did them over about a year, so I’d say four months to do the first block is probably about right. Mind you, you have included the two Comms ones which are a bit Micky Mouse.
Do not underestimate the importance of “bashing the bank”. Yes, of course you need to study and understand the subject, but you could easily flunk the exam if you’re not accustomed to the questions, even if you know the subjects well.
Everyone’s different though. For me, cramming each subject into a week wouldn’t have worked. But presumably it did for rudestuff.