Lateral entry

Yes, you can do B.Tech in CSE through lateral entry.
BITS Pilani
IIT-Delhi
National Institute of Technology, Karnataka
VIT University, etc.

Indian Maritime University (IMU) conducts IMU-CET (Common Entrance Test) for admissions various programmes offered by IMU campuses.
For more details, please refer to:
https://www.shiksha.com/university/indian-maritime-university-chennai/imucet-exam

Dear,
There are several colleges but I will tell you to choose the best such as LPU, SRM, VIT and Bennett University.

Yes, anyway The weightage of 12th standard's percentage matters the most. A minimum of 50% is a must.

You need to appear for IMUCET.
Interested candidates can apply online/ offline with required information. Candidate has to appear for the IMUCET (Indian Maritime University Common Entrance Test). Link:https://www.shiksha.com/b-tech/course/b-tech-in-marine-engineering-lateral-entry-himt-college-kilpauk-chennai-268542

Eligibility Criteria for admission :
Age : Maximum 32 years
Candidate must have passed Diploma in Engineering/ Technology or B.Sc. in Mathematics from a recognized board or university with minimum 49.5 % marks (44.5% for reserved category).
Maximum age for reserved category or female candidate is 35 years.

Yes, you are eligible. Eligibility for BE (Lateral Entry ) -
Candidate must have passed Diploma in Engineering/ Technology or B.Sc. From a recognised university.

Hello Nitish,
It is very nice to hear from you that you are interested in seeking lateral entry in a B.Tech course after doing your Diploma. Different states have different rulings for policies for coordinating or regulating admissions of lateral method. Some States conduct entrance exam for this while majority of the states give admission based on the marks obtained in the Diploma course. You will find all this information on the website of the Directorate of technical education of your state. Best wishes to you for your efforts in seeking Admission under this method.

Yes, you change the branch in B.E/B.Tech after Diploma. But, it varies from university to university.

Hello Avjit,
Admission for B.E Computer science engineering in Lateral entry is available in RRCE Bengaluru. Admission is based on merit screening of your marks in diploma of computer science engineering. You need to register and apply first.
All the best for your future.