There are three sections in UNI GAUGE- Physics, Chemistry and Mathematics. The syllabus is as same as 11 and 12. NCERT Textbooks (for XI and XII) are the best books for preparation. Many questions are being asked directly from NCERT textbooks. Other books you can study- Concepts of Physics by H. C. VERMA, Concept of Physical Chemistry by P Bahadur, Organic Chemistry by O P Tandon, Objective Mathematics by R D Sharma etc.