Since you want to pursue MBA from Indian Institute of Management right after B.Tech in CSE, you would require to appear for the CAT Common Admission Test in the Final Year of your Degree. CAT is the gateway to Top Management Institutes like IIMs, SPJIMR, Management Institutes of Top IITs, IMT Ghaziabad and so on. Assuming you are from General Category, having an average academic record with zero work experience, you would require atleast 99 percentile to stand a chances to secure a call from Top IIMs in the Country, hence that shouls be your first Target. Once you ace the exam, you would have to appear for further Admission Procedure like GDPI and WAT leading to the Final Merit List for Admission.

For more information about CAT do follow the link below

https://bschool.careers360.com/exams/cat

For more information about the Different Indian Institute of Management in our country follow the link below

https://bschool.careers360.com/colleges/list-of-top-iim-colleges-in-india