Hansraj College, University of Delhi

You just have to fill Delhi University admission application forms. Rest will depend on the cutoffs of university colleges, if your score will lie under that, you can get admission. Good luck.

No, it is not possible, if you don't have any reservations.

No, Hansraj College does't offer BCA courses. Instead, it offers only B.Sc (H) computer Science.

Yes you need to fill the registration form which are already out there on DU site.

They are the total seats in all the colleges of Delhi University.

No, you have to register for the course you want to take admission in.

The exam is conducted in June end or July starting.

Hansraj College is one of the most reputed college and it do offers placements and is better than other colleges of Delhi University for computer science. But, yes, engineering is always preferred over BSc (H). So, if you are interested in that do go for it, else HRC is good college.

You need to clear the entrance examination of the university.

There isn't any Entrance exam this year most probably as it isnt announced in the official website.
Also, no idea if you can get into SRCC, Hindu or Hansraj. It depends on this year's cut-off.