Hindi is one of the most important papers in government exams. There are many books for preparation for Hindi paper. Some of the bestsellers are-

• Adhunik Hindi Vyakaran aur Rachna by Dr. Vasudevanandan Prasad. It is a very good book to understand and clear all the concepts regarding grammar and writings.
• Hindi Sabdkosh by Dr. Hardev Bahari
• Samanya Hindi by Raghav Prakesh
• Samanya Hindi by Arihant Publication
• You should read hindi newspaper on a regular basis.