Hey lostlilsoul,
I wouldn't worry so much. I spent about a month studying using the exact steps outlined below and got a top score. I can't promise it works perfect for everybody, but I'm sure if you follow you'll do well so here's my 2 cents
You have roughly 5 weekends and maybe some weekday evenings to prepare. Thats 10 full weekend days (Sat, Sun) + some extra time from weekdays.
Study materials needed: GMAT Official Study Guide Bundle (3 books) + 6
Manhattan Prep Online exams. The forum doesn't allow new members to post URLs so please read carefully.
GMAT bundle
GMAT-Official-Guide-2018-Bundle/dp/1119396174/ref=pd_lpo_sbs_14_t_0?_encoding=UTF8&psc=1&refRID=8S49H48SEMQP9DN01KYR at amazon website
Manhattan Prep exams (start with free test)
/gmat/free-gmat-practice-test/ at manhattanprep website
There are a total of around 10 diagnostic tests (4 from bundle and 6 from MP).
Here is you schedule on a weekend day: Take 1 test (4 hours). Review the test (1 hour). Practice problems from bundle books (2 hours).
That adds up to about 7 hours. Do this on each of the 10 weekend days. You'll finish all the tests and most likely all the books. If you'd like, you can skip studying on a weekend or two and try to make up for that time during the week. This will prepare you well and I'm sure you'll come out a GMAT champion