Colleges in Delhi

The eligibility criteria in the qualifying marks (12th class) is 60%. You are eligible. Based on your JEE Main score also you are likely to get admission. Also, they take candidates till the age of 25 as on Oct 1, 2017. All the best!
Your question is about getting admission at DTU, which is why I told you the admission criteria and procedure at DTU. Admission process at DTU has nothing to do with JoSAA counselling. Admission to DTU will take place through JAC Delhi Counselling, which will begin in June/July. This means that you need not to apply in JoSAA if you wish you seek admission at DTU. JAC Delhi counselling is separate and you have to apply there separately based on your JEE Main score and 60% aggregate marks in class 12th.

Just go through previous year entrance question paper it's very easy and I'm mentioning some text here just read them.
Political Theory -By Andrew Heywood.
Key concepts in political science -By Andrew Heywood.
India since independance -By Bipin Chandra.
From Plassey to partion and after (Selected Chapters) -By Sekhar Bandyopadhyay.
Indian Government and Politics -By B.L. Fadia.
Introduction to the Indian Constitution -By D.D. Basu.
The Indian Constitution -By Granville Austin.
The Oxford Companion to Politics in India -By Jayal Mehta.
Comparative Politics -By J C Johari.
Comparative Politics -By V N Khanna.
Western Political Thought -By Nelson.
Political Thought -By C L Wayper.
Western Political Thought -By O P Gauba.
Makers of Modern Indian -By R C Guha.
Indian Political Thought -By Thomas Panthom.
Indian Political Thought -By Roy & Singh.
Indian Politics -By Singh & Saxena.
The Globlizzation of world politics -By Baylis Smith.
Theories of International Relations -By Kenneth waltz.
Global Politics -By Andrew Heywood.
International relations -By Gosh.
The Oxford Handbook of Indian Foriegn Policy -By Malone Mohan Raghwan.
Does the elephant dance -by Malone.
Politics -By Andrew Heywood.
Foundation of Comparative Politics -By Kenneth Newton & Jan W. Van Deth.
Cases in Comparative Politics -By Patrick H. O Neil, Karla Fields & Don Share.
Essential Reading in Comparative Politics -By Patrick H. O Neil, Ronald Rogowski.
Introducing Comparative Politics -By Stephen Orvis Carol Ann Drogus.
Current Debates in Comparative Politics -By J. Tyler Dickovick & Jonathan Eastwood.
Comparative Politics Integrating Theories, Methods and Cases -BY J. Tyler Dickovick & Jonathan Eastwood.
Comparative Politics Classic and contemporary readings -By J. Tyler Dickovick & Jonathan Eastwood.
AP Comparative Government and Politics: An essential course book -By Ethel wood.
The Oxford Handbook of Comparative Politics -By Carles Boix & Susan C. Stokes.

Hi buddy, Admission Process
University of Delhi, commonly referred as Delhi University (DU), offers programmes to aspirants at the undergraduate (UG), postgraduate (PG) and doctorate Ph.D. level. Courses offered at DU are in streams including Humanities & Social Sciences, Commerce, Science, Teaching & Education, Law, Business & Management Studies, Medicine & Health Sciences, Arts and Engineering. DU Admissions 2019
For the academic session set to commence in 2019, DU admission process would be such that candidates would be shortlisted for admission through DU entrance exam & Class 12 marks. Get more details here. DU Admissions 2018
The admission process for University of Delhi usually commences in the month of May each year. The first cut-off for DU admissions 2018 has been released. As was. For further information do visit this link
https://www.shiksha.com/university/du-Delhi-university-24642
Hope this helps!