hi,

after diploma in mechanical engineering you may choose following streams for btech lateral entry admission,

mechanical engineering

production engineering

mechatronics engineering

automobile engineering

now You should know that nits and iits has no lateral entry scheme for diploma candidates, you may go for state government engineering colleges and most of the colleges has option for lateral entry admission, you need to also appear in jelet, bihar leet entrance test, like state wise lateral entry exam test to get admission.

some of the top colleges,

1. VJTI, Mumbai

2. COEP, Pune

3. Thapar University, Patiala

4. SPCE (for mech, civil, electrical) and SPIT (For comp, it, electronics)

5. R. V. College of engineering, Bangalore

6. Manipal university, manipal

7. Sant Longowal Institute of technology, punjab

8. BMS College of engineering, Bangalore

9. VIT, Pune

10. PICT, Pune