The National Association of Rocketry (NAR) offers High Power Rocketry certifications for members who fulfill requirements. Three levels of certification, each authorizing a member to purchase and launch higher impulse rocket motors.
I got my Level 1 certification in 2018. To do this, I had to build and fly a rocket using a motor within the level 1 range (160 to 640 Newton seconds) and recover it undamaged. I built a relatively simple rocket which flew successfully leading to my certification.
To achieve a Level 2 certification, a member must first pass a written test before successfully flying and recovering a rocket using a motor within the level 2 range (640 to 2560 Newton seconds). For this, I built the Sepetron, named after the smallest solid rocket booster in Kerbal Space Program. It uses a flight computer to deploy parachutes along with some 3D printed components.
I initially flew the Sepatron in early 2020. While I passed the written test, the upper airframe bulkhead broke leading to a loss of the upper airframe. Because of school, I had to put the project on hold. Now that I have had time to fix the problems, I will fly again next chance I get to go to a launch.