How to lose weight fast?

Question

I am 13 years old I'm a guy and i am 5' 4" and weigh a bout 160. i visited my uncle over the summer and he is really bulk and said that i should lose fat not necessarily weight (although it would be bad if i lost weight) but he said that next time i see him he wants me to be in better shape. how can i do this in 17 days?

Also, is it possible to get a six- pack by then ? if nnot what are ways to get a 6-pak by winter?

Update:

yes , i asked this b 4 but i'm not getting any good answers

Answer 1

Did you ask this before?