Anyone knows what is the level of power prep plus 1, 2 and 3?

Anyone knows what is the level of power prep plus 1, 2 and 3?

Like which one is tougher than the rest? Is the scoring algorithms fine in these paid mocks?

I scored 320 in Power Prep Plus 1 - Quants 161 and Verbal 159
and I scored 316 in power prep plus 2 - quants 161 and verbal 155

Anyone has any suggestions or tips to share? I have my GRE in 7 days

https://www.gregmat.com/practice-tests