WARNING! Coming here w/o a basic knowledge of Spanish is like going to to north Greenland in shorts.
I rarely say "do not come." However, you can "improve" here, but trying to start at the beginning is close to impossible. Do not try it. Take at least 2 summer classes or something so you at least know the grammer rules and pronunciation rules, and some vocabulary. You can come w/ no Spanish. Some do, but of all the things I caution, you need the basics. It is hell w/o it. If you still want to try it, plan to at least pay a private teacher for a month or two.
"You do not truly understand something unless you can explain it to your grandmother." Albert Einstein