You have to find a list of colleges and their respective entrance exams and you need to apply for them so as to get admission in LATERAL ENTRY BTECH:

Some of them are:

DTU

Manipal

Netaji Subhash Engineering College, Kolkata

JMI

MIT Karnataka

Punjab University - Chandigarh

IP University - Delhi

Punjab University - Patiala

KIIT University

Thapar Institute of Engineering and Technology - Patiala

Government College of Engineering - Pune

Punjab Technical University - Jalandhar

Guru Nanak Dev Engineering College - Ludhiana

Sant Longoval Institute of Engineering and Technology - Sangrur

Anna University - Tamilnadu

 you can switch over your college/ Universitie after your First year of B.tech on the following basis 

You should have above 8 CGPA / GPA on both the semester of first year.

You should not have any arrear  / backlog in any of the semester.

It depends on the respective branch wise seat of that college where you want to pursue your degree.

The reason for leaving the college should be appropriate.

If you fullfill all these criteria then you can easily switch over to any College. 

Good luck