The Middle Season 1 Episode 24 (The Middle s01e24) with title “Average Rules” airs on Wednesday, May 19th 2010 at 08:30 pm via ABC.
Here is summary for The Middle Season 1 Episode 24 :

As Axl’s aptitude test results reveal him to be academically gifted, Frankie makes it her mission to get an overlooked Sue the recognition she deserves when none of her teachers even realize that she’s in their classes

Few hours after original series aired on TV, online streaming video for The Middle Season 1 Episode 24 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free