I want to pursue a diploma in mechanical Engg.through correspondence

Name: G.SRINIVASU
Message: I have passed two years I.T.I course in fitter trade WITH
78.2%. NOW I am working as a fitter in m/s Satluj Jal Vidyut Nigam Ltd,
Jhakri, Shimla dist, (H.P). I have 10 years working experience as a
fitter in hydro power stations .I want to pursue a diploma in
mechanical Engg.through correspondence which will be helpful in
enhancing my career prospects. Can you please suggest some good
options?