Why 'how many hours' is the wrong first question
Total hours barely predicts score movement on its own. Two students can log the same 30 hours and end up in very different places, because one spent it in four 40-minute sessions a week for ten weeks and the other spent it in three exhausted Saturday afternoons the week before the test. The first schedule gives each skill several chances to be practiced, forgotten a little, and re-practiced. The second gives it one shot.
So instead of asking for a number, ask two smaller questions: how many weeks do you actually have, and how many 30 to 60 minute sessions can you realistically fit into a normal week without it falling apart by week two. Multiply those together and that is your real budget, not an hours figure pulled from somewhere else.
How to size your effort to your score gap
Start with one full practice test taken under real timing, and score it by skill category rather than by the single overall number. A student who is already close to their target score usually needs to fix a short, specific list of skills, which takes fewer sessions. A student aiming for a large jump usually has misses spread across more skill categories, which takes more sessions, but the structure of each session does not change.
This is also why a fixed number like '50 hours' is misleading on its own. It hides whether those hours went toward the handful of skills actually costing points or got spread evenly across everything, including skills you already had down.
How to pick which skill to drill first
Rank your misses by how often that skill category shows up on the test, multiplied by how often you get it wrong. A skill that appears five to eight times per test and that you miss half the time beats a skill that appears once, even if you miss that one every time. Working the highest-frequency, highest-miss-rate skills first gets the most score movement per session, which matters even more when your session count is limited.
Within that ranked list, put skills where you understand the rule but keep messing up execution ahead of skills where you genuinely do not know the rule yet. Execution fixes are faster and build momentum, then you spend more sessions on the real content gaps.
What a productive session looks like end to end
Pick one skill from your ranked list. Do a small set, 8 to 12 questions, timed to match the pace of the real section (roughly 71 seconds per Reading and Writing question, 95 seconds per Math question). Grade it immediately using the answer explanation, not from memory. For every miss, write one sentence on why it happened. Decide whether it was a careless slip or a real gap, and end the session there. That is a complete 30 to 45 minute unit, and it is what a hard-earned study hour should look like.
Careless mistake or knowledge gap? The fix is different
Redo the missed problem later that day with no timer and no pressure. If you get it right that time, it was a careless mistake: a misread question, a rushed calculation, a sign error. The fix is a slower, more deliberate check on that question type going forward, not more content review, because you already know the content.
If you get it wrong again untimed, it is a knowledge gap. More repetition without relearning the rule first will not fix it, and can even reinforce the wrong method. Re-read or re-watch the explanation for that skill, then do a small untimed set to confirm the rule has actually landed before you time yourself on it again.
Why redoing a whole practice test is a poor use of a week
A full test gives you one data point across dozens of skills at once. Retaking that same test, or a fresh one, before you've reviewed and drilled what the last one found just repeats the same errors and eats a week that could have gone toward targeted drilling. One full test roughly every two to four weeks is enough to track movement; the days between tests are where the actual improvement has to happen.
Once a skill is fixed, it still needs a light check-in a few days later and again a couple of weeks later, or it tends to fade back into the same test you already corrected it on.