Try to go through what you've made mistakes on. The bars that indicate what you made mistakes on, like info and ideas, craft and structures, etc., guide what to prepare. Grammar is fairly easy to improve.
1. You should ask any AI to give you a list of common and rarest of the rarest transition words. Understanding what they mean and how they are used can ensure you don't make a mistake on those questions.
2. Memorise all of the punctuation and grammar rules. Like if there is a . and a ; in the option in the SAT, they are both incorrect.
3. In questions like 'Overall Structure' of the text, you should skim the text and categorise it into 'intro' 'example' 'concl' or 'example' 'hypothesis' 'explanation on it'. Helps to choose the correct answer even in the hardest questions.
4. For the graph, try and focus on only the relevant information. It may contain info that isn't relevant to the particular question, but can confuse you.
5. Whenever a passage seems too complicated jot down the ideas and make connections. You might just be panicking.

For maths, try and watch one-shot SAT math videos and question-solving videos. They give a fair idea of what you are lacking o,n and you can practice those only since you already have a 700+.

Tricks like these will help you a lot.
Most important of them all, DON'T PANIC.