Guys i have my exam in a week.

I took UWSA -1, 3 weeks ago with score of 232.
Now after 3 weeks i took UWSA 2 and my score is 580/236.

I gave offline nbmes with a mean score of 220.

I would like to know that i heard uwsa overpredicts the score. Is it true?
Second what should i do now to improve my score?

Please give me your valuable advice. thanks