I’m a sophomore in high school. My percentage grade this year was 98.42%.
How often do you perform timed tests? If you know the material well and get it, it may just be a stress factor. The SAT is also meant to be tricky. It's often more logic than pure knowledge. I would suggest checking out 1600.io
There are free and paying programs, but regardless they all do a good job. George goes through each practice tests and has a lot of helpful advice. Supplement with Khan Academy paper tests to get a real feel for the test.
Khan Academy really helped me a lot! It allows you to concentrate on one topic at a time, and you can take up to ten different practice tests, which are all free. I started off with a 1300+, but now my average score is above a 1400.
I used the khan Academy and the official college board books. Also practice 1 hour a day minimum alternating between English and Maths. Do timed practice tests. I used the college panda book for my Essay component and did quite well. Princeton review's practice tests also helped me. To ace in English, memorize the grammar rules and apply them while practicing. The more you practice, the better you get.
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