how to improve my velocity at 60ft

How did you play baseball in high school at 13? By my calculations you just finished 7th or 8th grade.

Around here 8th graders are permitted to try out for the HS JV teams. Several make it every year. Most are 14 but some don't turn 14 until summer.

Some private schools do let 7th graders play JV as well.

I was in the 7th grade when i played. The high school is a public school just 2 let ya know. And i did play on there freshman team(meant for pth graders) as well as the jv team. I was 12 at that time. I just turned 13 on the 8th of dis month.

Wow - that's different. Out of curiosity - how big is your High School?

which one we have 5 public high schools.
Bryan Station-1316 students(I played for this 1)
Lafyette-1989 students(I'll be going 2 dis one)
Dunbar-2170 students
Tates Creek-1681 students
Henry Clay-1954 students

This was 2005 demographic.

You will get stronger due to physically developing.....provided you work hard to develop your overall body strength in conjunction w/ conditioning (running of some sort).....also throw long in the off season....four days a week.....let's say Mon, Tue, Thur and Fri.....10 throws @ 30 ft, 10 @ 60 ft, 10 @ 90 ft, 10 @ 120 ft and then 10-15 min long (200-250 ft depending on arm strength)........if it's cold put more clothes on.....