HELP!Can anyone help? I need tips for track and Field!!?

I am in standing long jump for the Hershey's Track and Field and I was wondering if anyone has ANY tips on how I could jump farther. I currently jump around 7' 9" but I have jumped a 7' 10 in a half. I need any kind of information about standing long jump and how I could improve!! And Im already in a lifting rogram for strenght. Any help would be very appreciated!!Thanks