General advice.
You need to figure out why you are not scoring well.
Is it a content mastering issue? Where you don't have the content committed to memory?
Is it a nerves issue? Where you seeing questions and getting anxious makes you forget what you've learned and second guess yourself?
Is it an organization or discipline issue? Where you are studying sporadically/frantically with no plan in place or simply not sticking to a study schedule and not putting in enough hours?
Is it a test taking skill issues? Where you read the question and interpret it differently compared to what the test is trying to pull from you?