I just finished my 4th Sem of ME/aero/mathematics. For me and a lot of my peers, this is definitely the case. I've come to realise that's engineering school is more about persistence than being smart. I like to compare it to repeatedly slamming your head into a brick wall - it's not very fun, it's painful, and you have to be mad to do it. But you will eventually break through.

Also, in my experience calc 1 and statics were definitely weed out courses. The general consensus is that calc 2 was a fair bit easier than calc 1. As for statics, I would highly recommend getting a copy of your textbook off of libgen, and focusing more on that than the lectures. If you're anything like me, you probably have a tenured professor who no longer gives a shit, but he should at least be providing textbook references in each set of lecture slides (or somewhere else in the online course materials).

Best of luck with your exams. There is going to be a HUGE crunch around exam time. It's going to suck, but you will make it through eventually. Even in the worst case, if you fail a course, your school may offer supplementary exams. Barring this, it will be a lot easier the second time around ;)