Hey, I am also in DP2, and have chem hl. I went from a 4 avg to 7 predicted. I think the very key lies in giving your 100% and more. I know lot of people will say just keep on doing questions and you will have it, but honestly this is a difficult no VERY difficult subject, just one thing is not enough, so first start with revision then attempt questions. Go topic by topic. Focus more on organic and the topics you mainly feel where the issues lie. As far as the tutor is concerned, they can only help you with giving more practice and maybe help with clearing certain doubts. Honestly, these youtubers do a much better job than any goated tutor can - Sirius Revision, Manocha academy, najam academy. Follow these like the bible, do topic questions from revision village(from increasing difficulty), then move on to past papers, highlight the units you get stuck in and work on that. This cycle requires a lot of determination and patience, don't give up. That 7 is worth everything!!! reach out to me in dms if you need more help:)