Are there any other way to get a sentence reduction in State prison, since they do not offer RDAP?

The state systems vary by each state, most states offer a program for "good time" reduction for good behavior and for taking approved courses. Some state prisons even have a special matching of good time credits for number of days an inmate works in the kitchen. The federal good time is about 15% of sentence. States range good time credit from as much as 67% (do only a 1/3 of your sentence) to the same 15% that they have at the federal level. Best behavior may be your fastest ticket out. We will research this question further and post new findings as they are discovered.