I got admitted, I declined the offer and now I want to attend?

I got admitted into all the schools I applied to. I was sure I had it all planned out so I declined the offer of three schools out of five and was trying to decide between the other two. After researching some more though, I find out that one of the universities I had decided not to attend is actually the best one amongst all of them. Is it possible to change my decision or do I have to accept the fact that I will never attend that school?

Contact the school directly and do it ASAP. Nobody here can answer this with certainty.

Call them today and ask them.