If you can go to the library without going to college, you can only do simple and unskilled work such as borrowing and returning books. Internal libraries, such as purchasing and cataloging, need higher library science education to do well.
Undergraduate library studies library work, takes an examination of public library career compilation, or goes to junior college and primary and secondary schools.
If science students don't have library science enrollment quota, they can consider taking the postgraduate entrance examination for library science in the future, with a wider scope of work and a professional background in science and engineering, which is more popular.
I hope these are useful to you. We can talk about it in detail if necessary.