why are the actual questions so much harder than the practice questions?????

One thing I found out from taking the March and the May ones is that they are so much more difficult than any of the material I’ve been using to practice (cb question bank, practice tests, oneprep etc) I absolutely need to get a 1500+ for the June one and I ran out of resources to practice 😭 where can I get hard questions that are equivalent to the real ones? any tips on getting from 700 eng to 750+ range?