The math and hardest test give worse results. This game determines how good your CPU is (CPU cooling is also a factor, If you have bad cooling your results will be negatively affected). This is achieved by using as much of your CPU as possible and at the same time running a script that counts, after 15 seconds it will read how much random data it processed.
Credit to @DAT_SWED3 i added more tests MUST READ: When running this test, the game uses as much of your CPU as possible if damage happens I do not stand responsible for those damages. Don't run a game or something with a high memory use in the background for an accurate result