In your situation, I would go on a course. I’ve recently done mine through a 2 week course, and its definitely worth the investment. I met some great people and we had a lot of discussion about things I’d never think to ask but were very useful. It also makes you aware of exactly what the examiners are looking for e.g. if you word your answer wrong, you may not get a mark etc and the support of the tutors in this process is invaluable.
The £60 set from EOS would be useful if you buy your own ringbinder. Each section has a case study and multiple choice question at the end. You can find past and practice papers on the OCR website.
Also be wary of using old notes- parts of these can be out of date. I had a book which I thought was great, until I read the part that said that it contains all the latest regulations up until 2004 