Reset UWorld or do Amboss

I'm shooting for a 90th+ percentile Step 2. I have 6 weeks for dedicated, and before dedicated even starts I'm getting around 255ish on predictmystepscore.com I'm probably going to only use 4 weeks, so trying to figure what to focus on. My fear with reseting UWorld is it's not going to give me anything new. My fear with Amboss is the questions seem to be quite different from Step and I fear it's going to alter my test taking strategy. Thoughts?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: USMLE and COMLEX Step II Source Type: forums