Step one, whatever your timeline
Take a full length official practice test in Bluebook, timed, in one sitting. Not a section, not an untimed set. You need a real baseline and you need to know what two hours of concentration feels like.
Then score it and sort every miss into one of three buckets: you did not know the content, you knew it but made an error, or you ran out of time. Those three problems have completely different fixes, and most students spend their study time on the first bucket when their actual problem is the second.
If 2/3 x = 8, what is x?
Twelve weeks or more
This is enough time to fix content gaps properly. Spend the first six weeks going domain by domain, weighted by how much of the test each one is. Algebra and Advanced Math are each about 35 percent of Math, so they get the most time. Inside Reading and Writing, Standard English Conventions is about 26 percent and is the most teachable part of the section, since the rules are finite.
Work in short sets of ten to fifteen questions on one skill at a time, and review every question you get wrong by writing one sentence on why you missed it. Sets on a single skill are what build recognition. Mixed sets test it, which is a different thing and comes later.
From week seven, switch to mixed practice and take a full practice test every other week. Keep a running list of the mistakes you repeat. That list, not a textbook, is your study material for the last month.
Four to eight weeks
Not enough time for everything, so be selective. Rank your weak skills by how often they appear on the test and start at the top. A skill in the Algebra domain is worth more study time than one in Geometry and Trigonometry, because there are roughly twice as many Algebra questions.
Aim for four or five sessions a week of 45 to 60 minutes, plus one full practice test every other weekend. That is more effective than one long session on Sunday, because spacing is what moves things into memory.
In Reading and Writing, prioritize the grammar questions. Conventions rules like sentence boundaries, subject verb agreement, and punctuation can be learned in a few weeks and they are about a quarter of the section.
One to three weeks
Stop trying to learn new content. At this range the gains come from timing, accuracy, and not losing points to careless errors.
Take two or three full practice tests, and spend more time reviewing them than taking them. For every miss, decide whether it was a knowledge gap or an execution error. Drill only the knowledge gaps that appeared more than once.
Fix your pacing. You have about 71 seconds per Reading and Writing question and about 95 seconds per Math question. Practice with a per module timer so you know what falling behind feels like before test day.
The last week
No full tests in the final two days. Do short warm up sets to stay sharp, reread your mistake list, and make sure the logistics are handled: Bluebook installed, exam downloaded, device charged, ID ready, test center location confirmed.
Sleep matters more than one more practice set. Two hours and 14 minutes of sustained concentration is the actual skill being tested on the day, and it degrades fast when you are tired.
What does not work
Doing hundreds of questions without reviewing them. Practice only teaches you something when you look at what went wrong.
Studying the hardest questions when you are still missing medium ones. The routing system means Module 1 accuracy determines your ceiling, and Module 1 is not made of the hardest items.
Reading strategy lists without practicing them. A strategy you have read about is not a strategy you can execute under a timer.