Hey Adarsh, Yes you can take B.Tech course after completion of diploma in engineering. B.Tech course will allow you to directly take admissions to the second year of engineering.
For taking admissions in B.Tech, you must have to complete 3 years in diploma after 10th in any branch of engineering.
Some colleges take admission through lateral entry exams like Joint Entrance Examination of Lateral Entry ( JELET), Diploma to Degree Entrance Competitive exam, Etc. So you need to appear and crack these exas. Some colleges conduct their own entrance exam for getting entry.
Admission procedure varies from college to college. So you will have to contact colleges individually.
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