Honestly i cant really give much advice from my position because i pretty much only started studying for my jc 2 weeks before the actual exam, but i managed to get a B for maths.
What i did was pretty much just papers, thats the best thing imo anyways, just do papers
My main tips that I used when studying for Maths are as follows
1. Really understand why a concept works in Maths, Students who get a C or D know how a certain sum works, A or B students knows why certain methods will or will not work.
2. Write out in like the back or front of a copy all the formulas that are NOT in the Logbook, this will save a lot of time of searching through the book, and shows you clearly what you need to know.
3. Make sure the work is neat, remember the examiner has about 400 papers to correct, and will not spend all day searching through your work for an answer.
Work down the way, not side to side
And draw a red box around your final answer.
4. If a question requires a formula, write that first in a different colour pen, so that it is clear to the examiner you know what is needed to solve the sum
5. Attempt every question if you get an incorrect answer for example calculating the wrong area in part a) if you continue the answer you have and answer the question as norminal you can possible get 90% of the marks, as you demonstrated you know how to answer but made a tiny area at the beginning.
6. Read the Chief Examiers Report on the SEC Website, this shows you the exact comments and issues from examiners regarding certain topics, showing you clearly what they want in an answer.
Best of Luck
Here is my email address
Oh and I don't do have Geography notes, it's only Maths, History and Science I do
But I know SyranBrian [ Sorry if I misspell) Has some Great Notes in his discussions