Set in 
Baltimore, Maryland, the film follows the tale of the disadvantaged Tyler Gage (
Channing Tatum) and the privileged modern dancer Nora Clark (
Jenna Dewan),  who find themselves paired up in a showcase that determines both of  their futures. Realizing that they only have one chance, they finally  work together.(source: Wikipedia)
Tyler Gage foun himself in a school of arts MSA, who meets a girl name Nora Clark. Despite of curiosity around the school after he and his friend broke in the school audio room. And got himself to a community service which he see something new to his life.   
STEP UP 2
Brianna Evigan take over the rule as the protagonist of Step up 2 sequel. Andie west was a girl his member to a street dance crew "410". Sarah a friend of her mother take care of her and try to tell her to stop going out to the 410 crew. Andie don't want to left the crew because it is the only family she left. She try to run away from her Sarah house. Andie met Tyler at the club and  told her she have to go to school. Tyler came up to an idea to challenge in a dance battle, if she win, she can do what ever she want to her life, if Tyler won she will join MSA school of arts. But Andie lost to their dance battle and go straight home. Tyler convince Sarah and she agree. Andie had a hard time and had been kick out from her crew and start a new one. But it on turns out a disaster, one of her friend join to their crew and leave 410 crew. The last dance battle had been proven to all people from the club that they want to dance.
Trivia:
Do you know that ABDC 1st champion, the JABBAWOCKEEZ. This is the first movie they appear.
And not only JABBAWOCKEEZ but the WEST COAST RIDERS.
As the third installment in the 
Step Up trilogy, and the first shot in 3D, the film follows Moose and Camille Gage as they head to 
New York University, the former dancer of whom is majoring in 
electrical engineering  after promising his father that he would not dance anymore. However, he  soon stumbles upon a dance battle, meeting Luke Katcher and his House  of Pirates dance crew and later teaming up with them to compete in the  World Jam dance contest against their rival, the House of Samurai dance  crew.
Step Up 3D premiered in 
Hollywood at the 
El Capitan Theater on August 2, 2010 and was subsequently released worldwide on August 6, 2010, through conventional 2D and 3D (in 
RealD 3D, 
Dolby 3D, and 
XpanD 3D) formats. It was also the second movie to feature the 
7.1 surround sound audio format, the first of which was 
Toy Story 3.  The film grossed $15.8 million in its opening weekend, the lowest of  the trilogy, but went on to make more money than any other installment  in the series and has received positive reviews, with most praising its  dance sequences and effective use of 3D, while others criticizing the  repetitive story.(source: Wikipedia)
 
Moose entering college at NYU. Moose start his dancing again when he see the shoes of Luke Katcher that time. He found himself to a different dance group in New York city and start himself as a college student and a dancer.