AP

I study in the British board and am doing my igcse this year in UAE.
I want to join a university for an undergraduate engineering course after 12th that is AS levels.

So will they accept me and what is this AP all about; I have heard about it recently and have no idea?
Will doing these courses help me??

https://apstudent.collegeboard.org/home

They can help for college credit and/or placement. But, if your school does not offer them, no college has an expectation that students will take them.