If you're not sure about what to do after the 10th and want to join the Indian Army and Defence, here are some options you can follow:

1. Class 12: After clearing your 12th board exams, you can apply for Indian Army or Defence-related fields. You can choose any one stream among Science, Commerce, or Arts for your 12th. However, the Science stream provides more flexibility for Defence-related careers.

2. NDA Entrance Exam: You can prepare for the National Defence Academy (NDA) exam after completing your 12th. Clearing this exam will lead to becoming an officer in the Indian Army, Navy, or Air Force.

3. Technical Courses: If you're interested in technical fields, you can pursue vocational courses or ITI (Industrial Training Institutes) courses after 10th, which can provide entry into technical roles in the Indian Army or Defence.

4. Physical Fitness: Physical fitness is important for entry into the Indian Army and Defence forces. Engage in regular exercise and physical activities to improve your fitness, which will be beneficial during selection.

5. Consult a Career Counselor: If you're confused about which field to choose or how to apply to the Indian Army or Defence, consulting a career counselor will be helpful for guidance.