How to take off jailbreak to update?

I want to update to ios 6 but I'm stuck on jailbreak 5.1.1. If I try to update I will have to restore my iPhone but I want to remove my jailbreak and update without restoring. Another question is will I lose all my apps, keep my apps, or just lose my cracked apps from installous. Please give me an answer none of that "lol i don't know" stuff

First thing you have to restore no matter what.

Second thing all cracked apps downloaded from installous will make you lose them once you restore

Taking of your cracked apps isn't worth it if you are gonna jailbreak it again because iOS 6 is not fully jailbroken you should wait, also you don't have to delete your apps you can store the on Dropbox. Backup your iPad first, then restore.