Hello Vivek,
It is good to hear that you are interested in serving the nation. As far as the eligibility is concerned here are some of the things you need to remember. The minimum age for males is 20 years and the maximum is 25 years. For women, the minimum age is 20 years and the maximum is 25 years. The candidate needs to pass 10th, 12th from a recognised board. The height should be minimum 170 cms for general category and 162.5 cms for reserved category. The chest should be 80-85 for general category and 76-81 for reserved category.
I hope this was helpful and all the best