Hi jininibhagade,
The following link has all the information about the AP test
https://apstudent.collegeboard.org/takingtheexam
I'm going to see about the other testing for you.

Here's the information about AP taking at a College level

http://oneyeartransfer.com/post/63615103653/advanced-placement-exams-after-high-school

And here is a link about toefl

https://www.ets.org/toefl

Based on my sources Toefl is definitely a option two sources state students at a college level to the exam multiple times etc.

I hope these links help in understanding how the exam system works etc.

Should you have any other questions I will be happy to help you!

Proud to be a Khan Academer

Katrina