Go take a "Titer test", if you've been vaccinated then it'll show. Then just get the shots you need... Varicella is very expensive and most places don't carry it, so do a titer first. If your going to...
Do yourself a favor and take the CNA course, yes it does cost more than retaking the TEAS but those will be the very same skills you'll be going over again in the first semester of the program....