You don't need to wait for a rating. Instead, fill out VA Vocational Rehabilitation - Advance after exiting form VA 28-0588.
How can I become eligible for these benefits?
You may be eligible for these benefits if you become a service member or veteran with a service - connected disability, and meet all the requirements.
very good, in the face of professional and work assistance, can I find out if I am eligible for vocational rehabilitation?