Hey there! Have you ever heard or are you fimiliar with the punk band The Story So Far?
No I have never heard of them.  Have they made a lot of songs
Thy have released 3 studio albums so far, and they are still signed with a record company, so not too many
Have they had any hit songs?
One song "while you were sleeping" that was released in 2010 got mainstream but I wouldn't say a hit song. 
Are they similar to any other bands?
Punk rock
Punk rock (or "punk") is a rock music genre that emerged in the mid-1970s in the United States, United Kingdom, and Australia. Rooted in 1960s garage rock and other forms of what is now known as "proto-punk" music, punk rock bands rejected perceived excesses of mainstream 1970s rock. They typically produced short, fast-paced songs with hard-edged melodies and singing styles, stripped-down instrumentation, and often political, anti-establishment lyrics. Punk embraces a DIY
The Story So Far (band)
The Story So Far is an American pop punk band from Walnut Creek, California, formed in 2007. They are currently signed to Pure Noise Records and have released 4 studio albums.
History.
History Formation and early releases (2007–2010).
The Story So Far formed in Walnut Creek, California in 2007. Their name is taken from the New Found Glory song "The Story So Far". The band consisted of Parker Cannon on vocals, Kevin Geyer and Kevin Ambrose