In preparation for the official release of General Admission, MGK released a 10-track mixtape, titled Fuck It, on July 23, 2015. MGK had reportedly released the mixtape out of frustration, following Bad Boy delaying the release of General Admission several times. The mixtape is compiled of songs that were left off of General Admission, and was released to his fans as an apology for the delays. MGK released the album artwork and revealed the release date on September 11, 2015, via Instagram. Many fans took it upon themselves to spray paint the album title around their hometowns to show their support and loyalty to MGK's EST movement.
The album's second single, called "A Little More" was released on March 30, 2015, through the same channels, with the accompanying music video releasing on May 18, 2015. The song features a guest appearance by American singer-songwriter Victoria Monet, with production provided by Tommy Brown. "A Little More" charted on the two respective charts, performing marginally worse at 108 and 35 respectively; however, the song did chart at number 81 on the Canadian Hot 100.
The tracks "World Series" and "Gone", featuring Leroy Sanchez, were released via the same channels as their predecessors. However, these tracks did not chart due to the singles being album specifics, and were released with the intention to promote the album, as both were released a few weeks prior to the album.
Chris Mench of XXL found the album a step up from his debut effort, saying that, "General Admission has its low moments — the series of emotional, down-tempo songs is a bit repetitive by the end — but it feels much more cohesive than his last effort." David Jeffries of AllMusic stated that "General Admission can be corrosive and coarse like Nirvana's In Utero, but while it lacks that album's artistic weight, it's proud to be unattractive which, oddly enough, becomes this druggy downer's allure." Marcus Dowling of HipHopDX called it "a mixed-bag of an album that aims high and falls short, but an amazing story is told along the way." Conversely, Jacob Sigmon of WPGU said "the lyrics, production value, and overall message is sloppy and very painful to listen to."