TT556
Hello! As I mentioned before, I found the Henderson exams to be really useful in terms of familiarity. This, however, doesn't mean that practice exams are the only thing you should be doing. From my experience, your textbooks are your best friend! For maths, I'd recommend covering most of the Year 9 content and some of the Year 10 content (factorising/expanding quadratics in particular). My school uses Cambridge but I also purchased an Oxford version. I'd say the Oxford one is more slow-paced but also incredibly helpful since each set of questions is based on the former with minor changes.
Numerical reasoning is slightly more difficult to prepare for since it relies heavily on skills like pattern recognition than following formulas. I'm assuming you have experience with it since you sat the Year 9 entry so I wouldn't worry much about that, just continue doing more practice exams. One thing that I'd recommend that I haven't seen anyone suggest before is Sudoku. As odd as it sounds, whenever I was feeling too burnt out to study, I just did a few sudoku puzzles and I found that it did actually help.
As for science writing prompts, I used AI to generate them and then mark my work once I had finished writing. If your school uses Pearson for science, there are experiments after every lesson. All you have to do is come up with the results. They can be made up for practice as long as they're somewhat accurate or you could ask your teacher to give them to you instead.
Hope this helps! Good luck!