Best TOEFL and SAT platforms?

Hey guys, I have a solid profile (A-tier ECs/awards) and a decent budget, but need to lock in my test scores. I’m aiming for a 1400+ on the DSAT and specifically need a prep platform with a massive question bank for Reading & Writing since I've already burned through the Bluebook practice tests.

For TOEFL, I’m looking for a site with AI grading for the Speaking and Writing sections.

What do you recommend?

Thanks!