All schools I reapplied to that I got rejected post-secondary I was rejected from AGAIN post-secondary. Schools that put me on the "interview waitlist" the first time (but I didn't get an actual interview at) gave me a very early interview the second time.
However, every person is different, and every application is different. I think it depends on the hurdles you are overcoming, your timing, etc. etc.
i second the advice about contacting schools before you reapply. in my experience (accepted to 2 schools on my 3rd try), contacting the admissions deans or directors can be really helpful at some schools. of course, some schools will just not reply, but others will get back to you with helpful advice. they can't predict whether or not you'll get in, but some directors will go so far to advise you whether or not to try reapplying. also, doing this helps you to really point out the improvements you've made to your application. it's a good way to help get your foot in the door, even if just a tiny bit. best of luck with everything.