How to improve grades?

I'm planning on applying for biological science courses (AAA-ABB) and a natural science course (A* AA), and while UCAS predicted grades are A* AA (chemistry, biology, geography) my actual predicted grades are A* BB.

I think I'll be able to raise my biology grade to a higher a because I've mostly gotten As and high Bs throughtout, but does anyone have advice on how to improve my geography grade and maintain motivation? I do like geography but I really struggle with motivation about revising, especially doing practice questions

Any tips on motivation/ revision methods?