What are the tips for department change in IIT Delhi?

One of my friends could get into Civil Engineering due to her rank but chose to stay because of being close to her hometown. She started preparing for a department change and after working relentlessly for a year, she was able to get a chemical dual degree. This initially seemed impossible because of the geniuses she was surrounded with. 

The first semester was a nightmare as she scored only a 7.6 CGPA because of her poor performance in Applied Mechanics and Engineering Drawing. However, with a bigger picture in mind, she started working harder and by the end of the second semester, she was able to score an 8.48 SGPA. 

When asked for tips, she said she completely was relying on her luck but kept working to the fullest. She left no classes unattended and was the first one to submit assignments.

Ultimately, you need to work hard, trust the process and wait for the results patiently.