I am not doing well in Engineering and I don't know why. Advice please?

Thank you my friend. Again when I made this post I was really upset but I have taken your advice as well as others and I found that I do need to spend more time studying. My Calculus teacher gave everyone a chance to retake the calculus midterm and I did exceptionally well! It turns out I am no longer dooing poorly in my math class. It’s just physics now. I understand I just have to understand the equations and not memorize them. Like now we are working on cylindrical coordinates and it doesn’t seem really difficult because I took my time studying the basics which was triple integrals. I think I now have a deep understanding of it but I do need to practice it more. I have found that I need to sumurse myself in math because I want to become an Engineer. I need to understand the basics of Calculus like what it means and why it’s important to change to polar coordinates sometimes when integrating. I am so happy I made this forum because many people have gave me so much great advice. I know there will be trolls but at the end of the day I am going to do my best.