What are some ways I can get better at high jump?

When I was at practice, my coach said that I was a good jumper. He also said that I could break the school record, or county record if I practice my block more. The thing is that I can do everything, I just need to put it all together. What are some ways I can get better at high jump without it's bar and a mat (etc.)?|||Try to work on your Vertical jump. Trampolines really help.