I have an 11X Opt40 contract. What is Pre-RASP, and what will I be doing in it?

Pre-RASP: I've done it twice. Expect to spend eight hours a day sitting on pea gravel rocks, for weeks. People quit because of this. Sometimes you won't be released for the day until someone can find a particularly shaped rock. You'll have to rake the rocks flat a couple times a day. Sometimes you may be required to spend the entire time studying, sometimes they may let this slide. There may be PT tests or psych evaluations or some useful training or cool details like playing OPFOR or less cool details like building running trails. They may do height and weight if someone looks fat (they'll do everyone, but you'll know who the reason is). You will learn the Ranger Creed. You will amuse yourself by learning the true way to count rocks. You will also count elephants. You will learn about Black Magic and the Green Glass Door. Overall, it's not too bad if you can find ways to stay sane and awake while sitting on rocks for weeks...

Follow the COL's link. Pre-RASP is just that, we used to run one at XVIII ABC, cause the CG got tired of sending folks down there who boloed in the 1st couple of weeks. It is suppose to give you a taste of hell that the course is.PT and PT tests, skill valuations, training ,etc. . It is to keep us from wasting money on unprepared wannabe's tying up valuable school slots

Recommend you do some research and take a look at this...
https://www.youtube.com/watch?v=l8YDcifOhnM
Bottom line is it is going to suck. Be physically fit. Even then it's still going to break you off.