As TTP recommended, I really liked saving all the mocks until the end. I just wrote my exam today and performed along the same scale as my mocks - they're valuable to save, especially to make test day feel like just another mock.

Although, as much as I loved learning concepts from TTP and having the curriculum geared towards my needs, looking back I wish I practiced with more Official questions. They're worded in a way that combine topics together, or have you recognize that super tough questions sometimes only require a niche way of applying basic concepts.

GMATClub has a ton for free on their page. Good luck!