Other forms: testings
Use the word testing to mean the process of evaluating how something works or how well students have learned. Most colleges require applicants to undergo testing.
There are two kinds of testing: the testing that's done on products to make sure they work or are safe, and the testing that's done on students to make sure they're learning what they need to know. If you've seen a label on shaving cream or hand lotion that says "no animal testing," it means the company didn't experiment on animals when they determined the product's safety.