how, when and what course can a 37 years old 9th discontiued person can join?

Complete your +2 National Institute of Open Schooling provides ample opportunities. Details at http://www.nos.org/

If you want to improve your employability then along with NOS do some vocational course depending on ur attitude. It can be tailoring, Dress and Pattern making, Stenography.If you only want to improve your academic credentials then pursue 10+2 from NOS then may be graduation from one of the open uni