hi,

after completing diploma in mechanical engineering , you may apply for bachelors of technology course as lateral entry , and may take admission in second year of b.tech course. you are eligible to take b.tech course in mechanical engineering, production engineering, industrial engineering etc. also you may do certificate courses on cam/ cam, catia like mechanical softwares from msme. however mechanical engineering has well demand in industry and have good future ahead if you work hard and sincere at your studies.