hiiii kingyen is ur best friend when it comes to sehs, he carried me, heres what to do, excactly 1 yr ago i was in the EXCACT position.
First, after your tests always go to the catch up lession for JAC and watch and write notes on things u dont under stand, do this for 3hrs every wednesday, then for rest of the week do the homework, for all of it and make sure u understand ev erything, if u dont im pretty sure ur teacher can help, if not watch yt videos and understand it, spend at least 2hrs per day on that.
Verbal: https://img.sparknotes.com/content/testprep/pdf/sat.vocab.pdf do 10 words a day and revise them daily,weekly,monthly.
Nr: Do patterns and mock tests alot, they help me go from 25s to 90s
Writing: Always work on improvement, do one persuasive and one creative per week and ALWAYS LISTEN TO FEEDBACK IT IS NEEDED, I WENT FROM A 9 TO AN 19, it will help
Math: Do mock test and revise year 8 textbook, trust me, it does not go over year 8 and the math exam for sehs was easier compared to JAC, but work on time alot, i didnt get to finish 5 questions i knew the answer too, but dont stress if u dont. Also watch the wednesday revision class since they review the test.
Reading: ask @KingYen or anyone else, i did particully well on all of these besides reading, which i still did well in, but not superior level, maybe above avg or avg.
SEHS is rlly rlly ez if u follow this and be consistent, this is more then enough, but since comp will rise higher and higher, always stay consistent
