Flipping over on lift off. Plz help

Whenever I arm my quadcopter and lift up on the throttle, the whole quadcopter flips over. Can anyone help me with my problem?here is a list of my parts:- fly sky fs-ct6b reciever and transmitter
– kk2.1.5 flight controller
– 20 a Simone escs
- 980 kv motorsSo, I loI did mine based off of this instructablehttps://www.instructables.com/id/The...VC-Quadcopter/This is the motor layout:1--> 2<--3<-- 4-->Please help me! I've done lots of research and can't figure out the problem.Thanks for reading, I am a beginner and would really appreciate help!Oh yeah, I have a competition in a day, so please reply as soon as possible :)

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