Cram Session!
Yui and the girls are now taking their midterms. Unfortunately, Yui practices playing her guitar chords instead of studying, and she fails the exams. If she fails the retake exams, she cannot participate in club activities, and the club will be disbanded. A day before the retake, Yui still has not been able to study much and begs Ritsu, Mio and Tsumugi into helping her to study for her retake. Days after the retake, an exhausted Yui returns to the club room with full marks. To celebrate, the girls ask Yui to play the guitar chords she had learned, but she has completely forgotten them.
Aired 17/04/2009EP 3 - Cram Session!

K-ON!
Hirasawa Yui, a young, carefree girl entering high school, has her imagination instantly captured when she sees a poster advertising the ‘Light Music Club’. Being the carefree girl that she is, she quickly signs up. However, Yui has a problem, she is unable to play an instrument.
When Yui goes to the clubroom to explain, she's greeted by the other members: Ritsu, Mio and Tsumugi. Although disheartened at Yui’s lack of musical know-how, they still try to convince her to stay to prevent the club’s disbandment. After playing Yui a short piece which re-ignites her imagination, they succeed in keeping their new member and guitarist.
Along with the tasks of school and homework, Yui begins to learn the guitar with the help of the other band members, experiencing many mishaps along the way. However, with the school-festival drawing near and Yui getting stuck with her practice, will the Light Music Club be ready in time for their debut?
(Source: MAL Rewrite)