Hello Raj,
It is great that you are studying for veterinary and you may use apps but there a lot of books available for preparation which are more useful as they contain previous years'questions as well which are more helpful.
Some of the most useful apps to prepare for vet exams are-

• A Vet Tool
• VetPDA
• Merck Veterinary Manual
• Alive ECG Vet
• Pet Poison Help
• Choc Tox
• Cornell Consultant
• VTNE exam prep

You can go through these apps and decide whichever fits your requirements best and use it.

Hope this helps.