In all honesty, this is a decision that would be best made by yourself
. I'll give you tips on how to decide though
. I'm in first year Eng right now as well but I feel like these might help you:
1) What's your interests/hobbies? (Are you interested in buildings, infrastructure,roads( Civil))
Chem(Oil,fluid,etc)
Elec(Circuits,Power Engineering, HVAC systems)
2) What do you want to do in the future? (Automation Engineering? Electrical Engineer? Software Engineer?)
3) List the pros and cons of each section of Eng
4) Did you enjoy learning one course more than another?
5) D04 or C03? If im not mistaken, Mech has C03 components as well
ECE has Comp Eng classes, did you like D04? (More specific to like ECE, software,mechatronics , Mech)
6) Comfortable( Which are you most comfortable)
Lastly, look up on youtube, google search, and research each different type of Engineering.
Try to really make this day the day you really look into everything.
April 30th is the deadline so you still have two days! During these two days, It'd be best if you really think about what you want to do! Also, you can still bachelors in say, Elec, and then go into a masters for Aerospace or Biomedical. But, choose the major you are comfortably, want to be in, and feel like will benefit you the best!
A fellow ECE hopeful but with Society (fingers crossed)
Time for me to get some sleep after E03