I'm currently in the 1st-year in B.Tech in CSE but my current college is not good enough to teach CSE, how can I change my current college?

See, changing current college doesn't guarantee that the next college in which you take admission is good and up to the mark of expectation and in almost all the government colleges teaching is not quite good. So, I'll prefer you to take up the responsibility on your shoulder and start learning on y

Yes, after completing your 1st year, you can take lateral entry admission in 2nd year. But if you want to change in this year then some college take entrance exam some provides direct exam. Please check the below link: https://www.shiksha.com/b-tech/course/b-tech-lateral-entry-college-of-technology-