i want to study in all branches of engineering because I'm interested in all branches. is there anyway to get knowledge of all branches ?
Every engineering student must go through all the branch subjects at that first year and from 2nd year onwards your core subjects will start. It's good to have that passion towards all groups and it'll be helpful you to achieve higher ones.
All the best.

You have to choose one branch of Engineering to complete your degree because in 4 years you cannot be expert of all the branches and every branches having own difficulty level.
All the best