The best way to test how well you know your scales is to play them in different patterns.
In the video above, we focus on major scales that force us to workout the dreaded third finger. These scales include: F# Major, B Major and E Major.
Remember to always practice slowly, increase the tempo in increments and really bang down the valves. This will allow you to improve on your finger dexterity on the trumpet.
You can download this exercise so you can also work on the other 9 keys.