it's hussle and heart BUT you need skills too.
Why don't you want to play freshmen? honestly most younger guys, unless you are ridiculous, get much more playing time on Freshmen, then if it's obvious you're the superstar will get bumped up if they need help. You could easily find yourself lost in a minutes shuffle on JV
but
if you want to make it - attitude is key. Be unselfish but take (and make) open shots. Be a great teammate - high fives, etc. But honestly mean it. Don't miss a layup, don't miss a box out, when you make a mistake - it's my bad. Don't blow a defensive assignment. If the coach asks where you play - it's wherever you want me to play, sir. Sir is key. No screwing around, no half court shots, no 3's unless you can hit them. No trash talk, no swearing. No sucking up either though, that is so transparant. If you deserve to make it, you will, but be happy to be on A team; hs ball is the best time of your life. Work hard, enjoy every win; take every loss like a gentleman. And remember my team's motto - We not Me