I built satultra.com for students prepping for the digital SAT. You take full-length tests in the real adaptive format and timing, and every answer gets filed under one of the 29 skills the test measures, so you see where your points go instead of just getting a score. Then you work on the weakest skills first, with a short lesson and practice for each.

Free to start, no card. The score calculator works without an account: https://satultra.com/score-calculator

Feedback welcome, especially from anyone who took the digital SAT recently or tutors it.