You have a very good academic record.
Make sure to get your November SAT sent to your safeties.
In your practice SAT tests, what score do you consistently hit?
Your estimated family income would qualify you for a lot of need-based aid at “meet need” colleges. However, colleges that offer need-based near-full rides for families making 65-90K are the most selective in the country.
In addition to Brandeis, run the NPC on Dickinson, Connecticut College, St Lawrence. (Each is likely to return a different number but all “meet need”). Same for RPI and WPI (very different colleges though - RPI is very nerdy/geeky, WPI is very collaborative&hands-on but intense. Neither “meets need”. They’d be more likely to try and entice you with scholarships if you’re a girl, since they want to balance their gender ratio.)
What’s your net price at each of these?
What net price do you get from the UMass Lowell and UMass Amherst NPCs? These 2 don’t meet need.
Apply by the Nov 5 deadline to UMass Lowell and if (likely, so “when”) you’re invited to the Honors College, opt-in. You can apply with your new test scores to be sent directly (their average is 1280) or Test Optional and submit the 500 word essay instead.
Apply to Umass Amherst test optional and perhaps by Nov5; for CS you must have completed the math sequence through precalculus with straight As (by the end of junior year preferably). CS is nationally known there, but also highly selective. Depending on what STEM courses you’ve taken and whether you got straight A’s in them or not, it may be a safer option to apply to Informatics:
https://catalog.umass.edu/undergradguide/2023-2024/Page21866.html
Will you have taken Calculus and all 3 of bio, chem, and physics (honors) by the time you graduate?