>>13978745computer science isn't about programming.
you will pick up programming by doing more programming, which is expected of you as a CS major.
use resources from
>>13980690and leetcode to practice writing code quickly. Do personal projects to learn how to control large codebases over a long period of time.
Most importantly, actually learn computer science and not codemonkeying. Basically,
learn lots of math and science and how to solve problems using computation, not how you can be apply your knowledge of muh framework to get a job. You can do that, but don't neglect the basics.
Basically, by the end of undergrad, you should be able to tackle and implement everything covered in the below without much strain, even if you'd need to study it from scratch:
https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-801-machine-vision-fall-2020/ 
