Looking at your post history, all I can tell is that you're a non-US IMG, and you have "mediocre" scores per your own description. You didn't match last year. I don't know if you got any interviews or not. You applied to both Cat and Prelim programs at the same program. That's what I know.
Thoughts:
1. If you're going to consider applying to prelim GS programs, you need to do so knowing the issues involved. You're probably thinking that any spot >>> no spot. That may or may not be true. Yes, the US experience you would get in a prelim surgery program would be very helpful, if that's the problem with your application. However, you'll get no credit towards IM for your prelim GS year (or minimal credit), so you'll be starting over again. And, interviewing while in a prelim GS program is not easy. And, since you'll be looking for a PGY-1 you'll likely be going through the match again, which means having letters in by Sept 15th, which means asking for letters in Aug. Most likely those letters will not be very helpful, will state "molten has just started working with us, hasn't killed anyone yet. so far so good". Last, if you'll need a visa (suggested on some old posts), then that's another problem -- you're very unlikely to get an H1b for a prelim spot, and if you get a J and can't land a PGY-2 for July, you'll run into visa problems which may be unfixable.
2. Your best chance of getting a spot if you do a prelim GS year is at that same program. The IM department might get a chance to know you, etc. Thus, you should look carefully at that program. A prelim GS spot at a program where you would refuse to do an IM residency, or where they will refuse to consider you at all, is probably not a good idea.
3. Are you considering applying to FM instead? It would be much better for you to be in a 3 year program now.