How can I get to night school?

Depending where you live, because this is an international site, many high schools and community colleges have night courses that you can sign up for. Just find the high schools and comm. Colleges in your community who do, and apply and pay for fhe ones you want to take.

Where are you located?
You put this under Grad School - do you mean you want a high school diploma?
That's called a GED in the US, and you can call the high school nearest to where you are now and ask for GED programs.
If they don't know of a night program, find your state board of education site online.
If you can't find it, answer below and maybe we can.