College GPA Help

Hey guys I have a question for you guys regarding where I should go. Before I ask the questions here is some background:

-I have an army rotc scholarship for 4 years that I can use at a lot of schools
-My top choice is CU Boulder for Aerospace Engineering but I didn’t get into engineering and got accepted to their undecided program. However, I did get into Texas A&M, Syracuse, and Embry Riddle for aerospace.
-I can get into the engineering program at CU Boulder after my freshman year as along as I take calc 1 and 2, and two physics with calc classes and get an overall gpa of 3.0 by the end of my freshman year. I also have to get a 2.7 in all my math, physics and chem classes as well as the 3.0 overall

My questions to you are:

  1. your opinions of those schools and which ones are good or not etc
  2. How difficult those gpa requirements are for CU Boulder and if it is worth taking that risk
  3. how much time I would be able to put into study and tutoring etc despite having the ROTC commitment

Thank you guys!!!