Difficulty of PPE - E major

I was recently admitted to Ivey AEO and i am excited to commit to western. I applied for PPE E and Bmos and i’m currently trying to make a decision. i’m really scared that i will loose my AEO, esp in PPE E, since i have to take calculus and micro macro econ, which ive heard is more challenging. I am considering just doing BMOS instead because of the difficulty of the program although i am not very interested. for reference i only got a 91% in adv functions and about a 87% in calc as for midterms ( i do have a bit of senioritis tho so thats why my grade is lower than adv functions, i am def 100% not working as hard!)

If anyone that is in the program would be able to give me some insight on the difficulty and some helpful tips for calc 1, that would be amazing
Thank you!