Mock tests for GRE

I’m retaking the GRE exam in August. I’m concerned because I’ve already taken PowerPrep 1 and 2 during my previous GRE attempt, and I have no other mock test to give to assess my improvement except PowerPrep Plus. Is Manhattan Mock worth it? Can I attempt those mocks and expect similar results?

Review your diagnostic report of your recent GRE attempt → make notes on where the improvement could be made → study that → plan a single PowerPrep Plus at the end of your studies → Review the Result → give GRE again.