Some beginners are worried about joining in with advanced students, they feel that they might look silly if they don’t understand what they are being taught. They worry about paring up with higher grade students and with sparring with them.
This is not the case as we were all beginners once! In fact the advance students help the lower grade students, it encourages them to train as hard as their higher grades. Partnering a higher grade student will help the beginner, and they always spar more carefully than a lower grade. This system of the Kohai (Lower Grade) Sempai (higher Grade) relationship is extremely common in all traditional martial arts.