Subject Tests really needed in Texas?

Hi there,
I just recently received my ACT score and did well on it, maybe could be applicable for scholarship or merit… Anyways my main question is do I really need to take subject tests? I would like to go to UT or UTD or Texas A&M, all in Texas. I checked with all three, and all said that they do not require subject tests. If they do not require subject tests for admission, do they still consider them. I also keep hearing some certain majors or scholarships might consider or require subject tests, but whenever I contact the schools, I get iffy answers. I always thought that subject tests for these schools was never needed for any of these schools. I plan on majoring in computer science (engineering) (very strong interest) or pre med maybe. Thanks any response appreciated need to decide fast