A complete study package for MCA entrances- Arihant publication , Amit Aggarwal

Is sufficient and covers everything.

Check University MCA Entrance Last 10 or 20 years question with solution and another book for DU MCA Entrance 2019 syllabus wise subjects description and solution.

Start from the very Basic to make your base strong,Learn each type of problems and their techniques of solving, work on Quantitative aptitude and practice the previous years papers.

All the best!