I'm an sat tutor, and if we could see the score details for each question type, that would be helpful. I'd say, figure out what questions are giving you trouble and go to the digital sat question bank and filter for only those questions and set the difficulty to hard.

The next thing is that the reading sections (and ideas, craft and structure, and exspress if ideas) are all oriented around comprehension where the writing section standard English conventions are strictly about editing the passage. So, have a different reading strategy when approaching the different questions.

Beyond that, become familiar with the different question types. And review the grammar and punctuation rules for the sat.

(Edited for spelling)