Congrats on your achievements.
Need to know if you are a US citizen/permanent resident, or are applying as an international student.
What are your UC GPAs? GPA Calculator for the University of California – RogerHub
The professor LoR is not going to satisfy the requirements for a core course teacher at the schools that require two recs. Can you get another rec letter from a junior or senior year teacher? MIT prefers a rec from a non-stem core teacher in addition to your algebra 2 rec.
Only having math through pre-calc may give some of the schools pause for a desired CS major. What was your math ACT score?