Good Evening

Hope you are fine..

As per your query, here is the list of top 5 hardest major courses in Engineering:

1. Electrical Engineering
2. Computer Engineering
3. Aerospace Engineering
4. Chemical Engineering
5. Biomedical Engineering

To know more about engineering courses checkout given link below:
https://engineering.careers360.com/articles/list-of-engineering-courses-after-12th

Hope you found it helpful
All the best