Dear Ankit,

In order to prepare for UGEE entrance exam your syllabus is based on CBSE X1 and XII standard Physics/Maths/Chemistry and for Research aptitute test the test will be on critical and creative thinking.

To prepare for the exam you can take help of your 11th and 12th class text books. You can also refer to NCERT books to clear your concepts and to build your fundamentals strong. 

It is very important to practice as much as sample papers for your practice.

You can refer sample paper below for your practice

https://cdn.iiit.ac.in/cdn/www.iiit.ac.in/files/iiit/Section1-SUPR-Sample.pdf

https://cdn.iiit.ac.in/cdn/www.iiit.ac.in/files/iiit/Section2-REAP-Sample.pdf

For mock test you can refer below link

https://g21.digialm.com//OnlineAssessment/index.html?1926@@M1

Good Luck!!