Dear Namratha,

As far as I know, Manipal does not takes specific entrance Exam for MCA unlike their other courses. Admission to MCA in Manipal is based on merit. It considers score of KMAT (Karnataka Management Aptitude Test) and Karnataka PGCET. And  if you want some reference books for same I would suggest you to go through its previous year question paper and syllabus to understand demand of exams and prepare each topic thoroughly. You can buy any question bank from market which is with good quality questions and practice more. And also give more and more mock tests.