DRDO (Defence Research and Development Organisation) is a prestigious organization that conducts a variety of examinations for recruitment every year. Here are some steps to start preparing for the DRDO exam:

1. Know the exam pattern: The first step towards preparing for any examination is to understand its pattern. You can find the exam pattern and syllabus on the official DRDO website or notification.

2. Plan your preparation: Once you know the exam pattern, create a study plan that includes all the topics and sections of the exam. Make sure to give ample time to each topic and section.

3. Refer to good study material: You can refer to standard textbooks, previous year papers, and online study material to cover the topics in-depth. You can also refer to online courses and video lectures.

4. Practice mock tests: It is essential to practice mock tests to improve your speed and accuracy. It also helps you get an idea of the exam pattern and level of difficulty.

5. Analyze your performance: After taking the mock tests, analyze your performance to identify your strengths and weaknesses. Work on improving your weak areas and keep practicing.

6. Stay updated: Keep yourself updated with the latest current affairs and general knowledge, as these topics are often included in the examination.

7. Stay motivated and consistent: Keep a positive attitude and stay motivated throughout your preparation. Consistency is key to success, so make sure to study regularly and avoid last-minute preparations.

Lastly, it is recommended to stay focused and dedicated to your preparation, as the DRDO examination is highly competitive. Good luck with your preparation!