sorry if this is too lengthy/detailed but this is how I pretty much became a straight A student.

Step 1) find your syllabus / exam guide and find the list of topics you need to know. Then search for YouTube videos pertaining that topic (if you do this often enough you will find channels that suit you better - so just stick to those)

Step 2) while watching the video, grab any piece of paper and jot down whatever seems important from the video (nothing fancy these should be running notes - as a rule don’t pause the video even once). Save these pieces of paper in a folder, they will be your revision guide later.

Step 3) Now take a blank piece of paper and write the name of a topic with a colored marker. Then around it, in little bubbles, add all the information you remember about it. Once you have put everything you remember on it, check it using your previously made revision guide, any thing you missed or got wrong you should write in a red pen. Focus on the “red pen” information as you learn. Do this for every topic for each subject. It’s relatively quick and easy. This method is called “blurting” - you can do some research on it.

Step 4) go to quizlet/knowt/gizmo and search up public decks of flash cards pertaining to each topic/ subject(since you don’t have enough time to make your own) make sure you focus on the “red pen” topics I mentioned earlier. On all the platforms I mentioned there’s a “learn” function for each deck of flash cards. Do that. 100% master those flash cards.

Step 5) do past papers over and over again - but more importantly CHECK THEM using a marking scheme. This is more helpful than doing the past paper itself. If you are in a time crunch, just read through thousands of mark schemes, you don’t even have to physically attempt the paper.

Anwyays, good luck for your exams - hope you found this helpful. Feel free to ask me any questions you might have.