First of all, it is great to hear that someone at your age to be interested in achieving such goals.
But I am not sure what your background is. let me ask you a few questions first.
1. How much exposure have you had to Buddha Dhamma?
2. Why are you interested in getting to the Anagami stage? Are you already a Sotapanna?
2. What do you understand to be a Sotapanna and an Anagami?
Brief descriptions would be fine.