I have had my ear pierced for 4 of 6 weeks. School want me to take it out. Should I keep it in?

It will depend on the type of school and also the dress code. See if you can find out what your school dress code is on piercings. If you can't find anything on piercings in your dress code wear it and tell anyone that tells you to take it out that there is nothing wrong with you wearing it.
In my personal opinion I think you should wear and not care what other people say but I don't want you to get in trouble and get suspended.