Hello Praveen,

There cannot be a single book that can help you with all your exams. There are dedicated books for every kind of competitive exams.

But I'm mentioning some books below that my friends found really very useful for their stream :

• Objective Mechanical Book by R.S. Khurmi
• Conventional & Objective Type Question & Answers On Mechanical Engineering for Competitions by R.K. Jain

Hope this helps. You can contact for any further guidelines.