Here are some of the important tips for the preparation of NDA entrance exam you can follow given below:
Syllabus Details: You must have a proper source of the syllabus because a well-prescribed syllabus supports you in making a proper schedule for the examination.
Make A Proper Schedule: You should make a detailed schedule for the examination, those students follow a schedule they may get success in the examination.
Basic Logic Should Be Clear: You must do the analysis of complete syllabus as well as mark the important topics which need concentration.
Practice: Do practise as much you can because Practice will help you in achieving the goal, and a practice is the only key which provides you with an assurance for success in the examination.
Short Notes: Notes will help you in taking the permanent record, and it always helps to a candidate in preparing best for the examination.
For preparation of NDA you can refer to RS Aggarwal and Arihant Publication.
You can also refer to previous year papers to understand the exam pattern and level of the questions.