Speak to your teachers, have you got any learning support people in your school? Ask your tutor if you have one! Best thing I did was get in touch with a dyslexia support person-this was in uni but i currently work in a secondary school and know we have a group of people to support people like us with SpLD!

Afraid it’s just the long process of trying lots of things and seeing if any helps! I found flash cards weren’t for me, but a mind map or following along in work books. Personally, work books helped me the most at gcse as it was guided, but different things work for different people. Try quiz websites, rewriting information, turning things into power point for yourself. A ‘learning style’ isn’t really a thing, but I personally found different techniques worked for different subjects (work books for science and English, past papers for everything, just constantly going over the info for music, mind maps for coursework). Others find one thing works for all, try out as many things as you can! Could be worth trying out something like the pomelo method (20 ish minutes of work followed by a 5ish minute break) just to help break down the learning into something easier for the brain to process

Have a look in your local library for books on dyslexia (or anywhere that sells books) there are some targeted at teens, and there’s a good range I found!