HELP: Study plan for improving quant in 20 days

With an 18 percentile, you must have received a very low sectional score in the Quant section. I believe that you still need to have concept clarity on several Quant topics. Having said so, I would advise you to work on your pacing. Were you able to complete all the questions in the Quant section? Did you rush through the last few questions and invariably get a string of incorrect questions at the end? Did you spend more than 3-4 minutes on a few questions? If either of these cases resonates with you, then pacing is indeed an issue for you. In such a circumstance, you must first make a strong time strategy to attack the quant questions on the test. I would advise you to study for 10 days and then reschedule your test based on your next practice test performance.

All the best.

Thank you for the kind reply, as well as to the two posters above you for the ressources.

On my two Mock Exams on the official page i scored a 43 and 39 on my two tries, at the real test i only got a 31 however. I really struggled with the environment, the stress and somehow got questions that i was completely lost on. I definitively have some areas where my fundamentals are horrible, geometry beeing the worst, followed by algrebraic manipulation of formulas with fractions and powers in them... Which is what i am currently training hard.

As for pacing: no, i was not able to complete it. Actually, i was never able to complete any quant section on time, i usally end up with around 10 questions left in the last 10 minutes which i then try to guess / go through more quickly than usual. What do you think is the better strategy: 1. skipping a questions that you don't understand withing the first 15 or so seconds to save time for other questions or try them anyways leaving the last questions for guessing? I try to be faster but need a good 3 minutes at least to answer any question that has several calculations in them. For DS i usually don't write down anything at all if i don't have to, instead try to imagine if the information is sufficient by thinking of a equation or plugging in numbers in my head.

Sadly i cannot reshedule, my application deadline is the end of february for my top 5 universities, and around my location there is only a single test day that i can attend, beeing the 21st. I need whatever i can get up to that date, hopefully getting upwards of 650+ as a target. My Verbal usually carries my score somewhat, but i want to get at least a 45 on Quant.