How is the course structure and infrastructure facilities in north Indian Universities?

It entirely depends upon the geographical location in which the university is situated. For better clarification, look into various rankings, recognition experienced by institutes in recent years.

Totally depends on the college and course because different universities are famous for their courses in a different way.

Totally depends on the colleges and courses you choose. In the northern part, there are both good and bad colleges. It's better to check reviews before applying.