Recommended alternative provider for Level 1 mock exams

Hi,

I want some advise about which is the most suitable mock exam provider that can be used as a supplement to the CFAI mocks. In two words, which is the best, i.e either to try to solve as many as possible official CFA mock exams that were offered during previous years or to look for an alternative provider of these mock exams such Schweser or some other. My exam got cancelled and got extra time.

Please comment.

Thanks in advance!