hey,

to join tum Munich your btech first year certificate has no value. if you get selected you need to join from first year of computer science engineering in tu munich.

first you need to apply in the official website of technical university munich along with your testimonials. then you can check the status of your application.

follow the below link to know more details:

https://www.tum.de/en/studies/application/bachelor/application-bachelor/