Sure. After linking my khan academy to college board, the first thing I did was take the practice test 10. I think I got 1360 which kind of set the baseline. After this I did some of the recommended practice. After each set of practice there is a 15 min timed section, on both reading and math I did maybe 4 of those. After this I kind of stopped drastically increasing. I started taking practice tests weekly on saturdays, generally at like noon. I got 1450-1470 like 3 times in a row. I then realized that there was non recommended practice, and then I finished the entire grammar practice as well as math. The math practice did not help me much personally, as I got 780-790 pretty consistently on most practice tests, but the grammar was incredibly useful. With the grammar practice, I went from missing 10-15 questions on writing to missing 3-7. Math is just very predictable, after you see a few practice tests and you understand the concepts, you can basically answer everything. Reading was more difficult to work on, it just got better over time. This was mostly July to September. By the end, I was getting 1520+ quite consistently. Imo, Psat is harder than the sat, but thats just an opinion. I took the sat in november of junior yr, so I took 2 practice tests before, and I got a very solid score.
Basically math and grammar can be worked on with the non recommended practice, and reading gets better with practice tests. Just do practice relatively consistently