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Yes, it is possible to change your branch from Mechanical Engineering to Computer Science Engineering in B.Tech after completing your Diploma in Mechanical Engineering. You can apply for lateral entry admission into the second year of the B.Tech programme in Computer Science Engineering. This lateral entry admission is also known as the "Diploma to Degree" programme. To be eligible for lateral entry admission, you will need to meet the following criteria:
1. You must have completed a three-year Diploma programme in Mechanical Engineering or a related field from a recognised institute.
2. You must have obtained a minimum aggregate of 60% marks in your Diploma programme.
3. You must have qualified in the relevant entrance exam for lateral entry admission conducted by the state or central government or the concerned university. Once you meet the eligibility criteria, you can apply for the lateral entry admission process of the universities or colleges that offer the B.Tech programme in Computer Science Engineering. During the admission process, you may need to provide your Diploma Certificate mark sheets, and other relevant documents, along with the entrance exam scorecard. I hope this information helps you. All the best for your future endeavors!