As of today I am eligible for a waiver to SPC/ E-4 what can I do to prove that I am worth it?

CSM Maynard is dead on and now that you're eligible for E4, start dong the things you need to do to get promoted to E5.  By working toward those goals, your leaders will see that you are truly motivated and have the desire to excell.  Something as simple at PT can make a difference.  At PT you are in the view of all your unit leaders at the beginning of each day.  Trust me, the 1SG knows who the stragglers are and how the hot shots are.  When slots for schools come up, you want him to think of your name before anyone eleses.  If your PT test score isn't the max now, work on it and get it moving in that direction.  Good luck! 

Commit yourself to your job and get noticed! And when you get promoted don't stop!!! Keep going.

ALL these top NCOs are right and I know they are speaking from experience. From my personal point of view, I got waivers from PV2 to PFC and then from PFC to SPC. What I can say it that it all comes down to the SEPARATION. You need to separate yourself from the lot. Be the first to show up and start working when others wait to be told. Don't wait till room inspection to get your room tidied up. Don't wait to be told to get a hair cut. Don't wait to be told to get some civilian classes going. All these are what they call TAKING INITIATIVE. They may seem so little and almost insignificant but they add up and that might be the urge you will have other others who are competing for the same waivers. It is a competition so separate yourself positively. Oh and lastly, choose your friends carefully...GUILTY BY ASSOCIATION is very real!

I think SSG Perez has the best answer. True commitment is the key to success in the military. Give everything you do and all aspects of being a Soldier your absolute best effort. Easier said than done. Good luck.