What is GPA test?

There's no standardized test called a "GPA test." GPA, or Grade Point Average, is a *calculation* based on your grades in courses. It's not a test you take; it's a number derived from your academic performance. You earn a GPA by completing courses and receiving grades (like A, B, C, etc.). The specific calculation method varies slightly depending on the institution, but it generally involves assigning numerical values to letter grades and then averaging them.