Hey Hemanshi.

You can use the link which is provided below to dowload the previous year question papers for various courses from the official website of JNU.

https://admissions.jnu.ac.in/searchquestionpaper.aspx

You can use the following link to check the syllabus-

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.jnu.ac.in/scss-syllabus&ved=2ahUKEwjcmoio_KHeAhVEK48KHZ1-C0wQFjACegQICBAB&usg=AOvVaw0ztb22ajdlu7-UuD6wX0DN

https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://admissions.jnu.ac.in/prospectus/jnuee/SIS%25201.pdf&ved=2ahUKEwjcmoio_KHeAhVEK48KHZ1-C0wQFjABegQIBxAB&usg=AOvVaw1mHI-QxW1_e1f72kLGN6u6

Best of luck!