STEP 1: SAFETY
If you or your friends are out riding and sustain a head injury, keep an eye out for these symptoms. They are a sign that you need to seek immediate medical assistance:

The guidelines on when and how to get medical assistance are linked here:
NHS GUIDELINES
STEP 2: RECOVERY

Recovery from concussion is not a simple case of a few days rest. The above table demonstrates how to progress through recovery for mountain bikers. For general advice including return to school advice, please click the CDC link below: