I was able to improve my score from a 507-->517 and I'll reiterate
@pBar's point above. Taking the time to identify why you are getting questions wrong is really important and planning and executing how to overcome those deficiencies is how your score will improve. I began by sorting every question into categories after I took my first practice test.
1. Right answer and correct logic
2. Right answer and wrong logic
3. Wrong answer and correct logic
4. Wrong answer and wrong logic
The goal was to get all #1s of course, reduce the #3s, take the #2s and add them into the #4 bucket because they were inflating my score through luck. Then I took all the #4s (including the #2s) and systematically went through each question and put it into further categories.
1. Lack of knowledge
2. Lack of reasoning/misunderstanding
3. Time
Finally I put together a plan to address the questions/respective categories in each group. At first this took a really long time, but I felt that my studying became more effective and efficient along with having the tangible reward of seeing more #1s and less #4s, which kept me motivated.
Hope this helps and best of luck!