Is it safe to assume I won't get financial aid

Also don’t assume you get what your brother gets. The fact is some parents can’t make it all equal, and certainly kids are not all equal as students destined for the same uni experience. I would assume your FAFSA EFC from a 250K income will give you a higher EFC than both kids would cost at 50K combined (it might be 65K or so). Do fill it in though with multiple kids in school. Run NPCs and have the money talk with your mum, make sure to apply to your local options. Even a hypothetical SAT in the 1400s isn’t usually going to bring big merit at desirable schools. Have a budget outlined.