GMAT Reading Comprehension (RC) | Re: ALL GMAT PREP RCs-COLLECTION

First of all, I really appreciate your hard work in putting these together.PiyushK
I saw that these were posted in Aug'14. Is it a good idea to attempt all these RCs now before I even attempt any of the GMAT prep tests? I'm not sure whether the prep tests have been updated with the new RCs since its been exactly(or maybe more than) two years since these were posted.

And how soon they get updated? Does anyone know about it?