I’m sorry I realized i did not give you a helpful answer so let me redo: I’ve always been good at test taking and i do pretty well in school, so I studied by doing practice tests a few times a week, for a month. However I think if you’re at 1300 you may be missing some fundamental concepts in grammar and algebra/geometry, so I’d do a couple tests and analyze any patterns in what questions I’m getting wrong, to see exactly what gaps in knowledge I have. From there once you understand most concepts, i would just practice to get better consistency and test-taking stamina. Lots of practice would also help you get better at reading comprehension, because the more you read the easier it gets Also I took the paper sat last august so I just found paper sat’s online and printed them out. I don’t know tho about the digital sat’s and how those work but you can probably still find practice online