AP tests or Advanced placement tests are tests of 37 college level courses and exams across 22 subject
areas. The Calendar and fees is here. AP tests are two to three hours tests with both multiple choice and essay
questions.The tests are graded on 1 to 5 scale. A grade 3 or better may be eligible for the credits for college. A score of 4, 5 is considered as excellent.
There are many advantages of taking AP tests: read here
Why should you take AP tests?