How do i jump really high in high jump BUT doing a regular jump?

Hi, i want to jump really high to go to zone I'm only 12 but i need to jump really high doing a regular jump no belly flops and flosbery jumps or what ever! Thanks |||i can just say get a good run up and jump off the right leg and dnt put ur hand down towards the bar. I dont do the flop coz it stuffs my back. I managed to win with just scissors kick at skool and i jumped about 1m 30cm|||run as fast as you can and dont take little steps or slow down when you get near the bar. if you are doing the flop when you bend your knees to jump swing your arms to give you more momentum. with this technique i jumped as well as two guys that are one year older and are two of the most athletic guys in there grade. :) good luck hope i helped