Preparing for the JNU entrance exam for an MA in History requires a comprehensive and well-planned approach. Here are some steps that can help you prepare effectively:

• Know the syllabus: The first step is to go through the syllabus of the JNU entrance exam for MA History. This will give you an idea about the topics that you need to cover and the weightage of each topic.
• Gather study material: Gather all the relevant study materials such as textbooks, reference books, and other resources like previous years' question papers, online materials, and notes.
• Make a study plan: Plan your study schedule, set achievable targets and deadlines, and allocate sufficient time for each topic. It is important to balance your time between different topics and sections to ensure that you cover all the topics in the syllabus.
• Focus on key concepts: Focus on understanding the key concepts and themes in history. Also, focus on the analytical and interpretative skills required for studying history.
• Practice writing: Practice writing essays and short answers on various historical topics. This will help you to improve your writing skills and also to understand how to structure your answers.
• Take mock tests: Taking mock tests and solving previous years' question papers is crucial to test your knowledge and assess your preparation level. This will also help you to identify your weak areas and work on them.
• Revision: Revision is key to retaining the information that you have studied. Revise the important topics regularly and make sure that you are well-prepared for the exam day.

In addition to the above steps, it is important to stay updated with current events and happenings related to history, both in India and the world. This will help you to gain a broader perspective and a deeper understanding of the subject.