Am I eligible for direct second year admission in B.Tech computer engineering? I am a Diploma holder in computer engineering.

You are eligible to take admission in the second year of the course. You must have done your Diploma after 10th with min 60% and you need to qualify LEET or university specific test. Institutes which offer direct admission have certain criteria for admission. Either they offer admission on the basis

Yes, you are eligible to appear and qualify in B.Tech (lateral entry entrance exam) organized by various states and college authorities.