"I heard the CRJ course helps low time pilots to get an interview and from washing out in training."

I'm sure it does. But an RJ course is no substitute for real life experience. I'm not sure what your experience level is, but 121 ground school isn't all that hard if you pay attention and have a good attitude. I wouldn't spend money for an RJ course unless it's the only way to get hired because of low times. And if that's the case, you shouldn't be in the seat anyway (just my opinion).

Welcome to APC.