i can not try in IOCL,BHEL,NTPC AND RAILWAY ETC. DUE TO MY DIPLOMA THAT OBTAINED THROGH (DISTANCE LEARNING MODE) SO WHAT I DO ?

Hi Guddu, Please don't worry. After diploma it would be advisable to go for lateral B.Tech course i.e. direct entry into the second year. Pursuing a degree course will open more career opportunities for you. Below is the list of lateral entry colleges : -Janeta Subash Institute of Technology -

If its possible, go for further studies. preferably engineering...