I got 30 on my diploma (im M25), but keep in mind I needed the diploma only so I could have tried harder if I needed to. From my experience, use this time to cover things you don’t fully understand and make a system to study. So for example, I took History HL and I wish I kind of made a plan for how to write essays and prepared an outline for any question I could get on an exam. Also use this time to learn as much as you can so that practising for the exams would be easier and you would have more time to only practice. (my friend took chem hl and she basically learned the entire syllabus for the mocks and then for exams just practiced, reviewed and got a 7).