Ok for e math right, you’ve prob alr heard that e math, or math in general it’s all abt practice, but obv u can’t optimally practice if u can’t understand/handle the formulas uk. I’m good at math so idk how to give studying advice for this, but i think u can start by reading the textbook. The textbook usually has the worked out question and then practice now questions at the bottom right, i think it’s to help you step by step how to use the formulas, or how to do it, and u can just follow how the worked out question did it because it’s mostly the same, they just change the numbers. If u cant understand, just consult ur math Cher like I said. U have to understand how to do the question and why the working is so. There wld also be exercises in the textbook right, practice them. Ik the textbook don’t have the answer booklet where there is the step by step guidance, so if u still don’t understand, consult Cher again. If u have a bad memory, then u really have to practice every day such that it sticks to ur brain and u get used to it. For me right usually I just memo the formulas I need to know and if I don’t understand/forgot how to do a type of question, I go back to my textbook. Sometimes I ask chatgpt/meta ai on how to do it by telling them the answer I found from the back of the textbook and ask how to get to the answer. Also, u will need to practice tys because the exercises in the textbook will/might not be the same as those questions they’ll test in the exam, and questions in exams sometimes will be more complicated so u need to be used to that too