What are learning opportunities ( courses/diploma )available for the people having pass class in Bcom.and now at the age of 30yrs.is there any scope in computer world?and thereafter what are job opportunities available in Private/Public Sector ?

Usually, a BCom background would count less than say BCA or BTech in the programming line. However, if you feel you have good analytical skills, you may overcome that issue. Go for an MCA. Or you may go for a course. It is always better than a gap on your biodata. If you like programming go for Java