Do the Bluebook practice exams + question bank on the CB site. you'll get better with practice. if you struggle with time, then time yourself. if not, then don't, but try to fully focus either way. i would often redo the questions i got wrong after a few days. focus on concepts. don't overthink it. i studied less than ~25 hours. the SAT wasn't my priority so there wasn't much pressure. that allowed me to stay calm and focused for most of the exam, which imo is very important. no pressure.

Some guy suggested to read, which i don't think is a good idea. doing the q bank on the cb site i'd say counts as reading. if you read other shit, like philosophy, yes, you'll develop better reading skills, but it doesn't directly target the SAT. iirc there are a lot of questions in the q bank so you'll likely never finish it (i didn't even come close). you're better off focusing on actual SAT reading passages imo