@BambooForest for a discussion on the reverse switch and the pro/con of CS in A&S vs Engineering you can read this:
My Daughter is switching out to A&S this fall and I’m a bit concerned that she’ll be behind on distribution requirements in A&S having spent 2 credits on intro ES courses and 2 on intro Phys/Chem (she only needs one). I can’t imaging switching in to Engineering from A&S- you’d probably be looking at a couple summer courses or 6-course semesters to complete the degree in 4 years (Eng requires 38 credits vs 34 for A&S).
If you took and received 5’s on AP Chem and Physics you’ll be in better shape. If you did not take AP Chem or Physics I would recommend you do some serious prep before you take Chem 1 and Phys 11, they are very difficult classes. Also I think you need to take Phys 11 for the Engineering degree vs Phys 1 in A&S.
A 5 on AP Calc BC wouldn’t hurt either, although she tells me that many students choose to repeat Calc because it is slightly different (Applied vs whatever they teach in high school).
Regardless, my strong recommendation would be to discuss this with someone as soon as possible in September. If this is something you want to do, you need to plan for it so you are not repeating classes sophomore year or looking at taking 11-12 classes senior year just to graduate on time.
My Daughter was never a good match for Engineering, so probably not the best measure, but she says everyone is very stressed out in her Engineering classes. And COMP15 when Mark Sheldon teaches it.