"CST, CR, Aid in Sentencing" are names of evaluations. I have no idea what they mean, either. They're used in a specific field, so your best bet would be to check with the department/person who provided the checklist.
 "if inpatient 15B" refers to Competency to Stand Trial Evaluations pursuant to M.G.L. chapter 123 § 15(b). Again, please check.