I'm a non-native English speaker. I have took other prep courses, but what they really teach you is how to answer a problem. Given the time constraint and competitiveness, how to solve a problem is not the only thing you needed, you need some tricks to get ahead of others. It's like any other game that you play. If you just know how to play a game, only that doesn't get you anywhere, but you also need to know how to tackle it wisely. That's exactly what EMPower teaches you. It's really worth it. It doesn't matter what prep course you follow; this is a must for you if you want to learn some tricks and tips. It's worth every penny.