I would use the disprove method (maybe untimed) until you're consistently getting the questions right. For every question, make sure you understand why every other AC is incorrect. I used to think timing was my main problem (and though it is still a problem), my accuracy was actually not up to par. If you take it fully untimed, are you still ending up with two ACs left? There is only one right answer, so if you really scrutinize the ACs, I think you'll get to the right one. If you still can't, I think maybe a refresher of the core curriculum might help. You absolutely got this!!!