This is a calculator I got for my algebra class. It is light yet efficient and it runs on solar power so you don't have to worry about it dying when you're in the middle of taking a test. It has all the simple functions of a calculator as well as the functions a scientific calculator has such as pi, square root, log, PRB, etc. It was very useful for anything I needed up until pre-calculus.
I like how it has a few functions that a graphing calculator has. It can store problems in its memory which is useful especially when I mess up somewhere and have to start over from a certain point. I don't usually use this calculator for tests, but I know I can depend on this calculator no matter what because its battery is solar-powered unlike my graphing calculator which runs on 4 triple A batteries and doesn't tell me when they're about to die.
If you're looking for something reliable and handy, go out and buy one of these. Great at the office, at school, at your SATs, and wherever you could use a calculator!