Science

Yes, you can opt psychology as an elective subject offered by the colleges for 2 years. For more information, visit Delhi University’s website.

No, there is no entrance exam they provide admission based on merit list. You can get admission here.
Good luck.

Exam Date: The exam will be organized from the third week of June 2019. Exam Mode: It will be organized through CBTmode.
Duration of Exam: The exam duration will be two hours for all the courses. Type of Questions: The question paper will be comprised of Multiple Choice Questions (MCQs). Number of Q

Yes, a science student can easily take admission in BA psychology. Moreover, a science student can take up B.Sc in psychology and arts students can take up BA in psychology.

Yes, they provide placement in M.Sc zoology at Andhra University. You can apply for the admission here.

You could check out the details of the placements in the placement report of the year 2017-2018:
https://amity.edu/Gwalior/pdf/Final_Placement_Report_Highlights_2017-18.pdf