I'll go with the Hot 100. By the way, I'm only counting the #1's that occured WHILE I was in school, not summer.
Freshman
"Shake Ya Tailfeather" - Nelly, P. Diddy, Murphy Lee
"Baby Boy" - Beyonce featuring Sean Paul
"Stand Up" - Ludacris featuring Shawnna
"Hey Ya!" - Outkast
"The Way You Move" - Outkast featuring Sleepy Brown
"Slow Jamz" - Twista featuring Kanye West and Jamie Foxx
"Yeah!" - Usher featuring Lil Jon and Ludacris
"Burn" - Usher
Sophomore
"Lean Back" - Terror Squad
"Goodies" - Ciara featuring Petey Pablo
"My Boo" - Usher and Alicia Keys
"Drop It Like It's Hot" - Snoop Dogg featuring Pharrell
"Let Me Love You" - Mario
"Candy Shop" - 50 Cent featuring Olivia
"Hollaback Girl" - Gwen Stefani
"We Belong Together" - Mariah Carey
Junior
"We Belong Together" - Mariah Carey
"Gold Digger" - Kanye West featuring Jamie Foxx
"Run It!" - Chris Brown
"Don't Forget About Us" - Mariah Carey
"Laffy Taffy" - D4L
"Grillz" - Nelly featuring Paul Wall, Ali, and Gipp
"Check On It" - Beyonce featuring Slim Thug
"You're Beautiful" - James Blunt
"So Sick" - Ne-Yo
"Temperature" - Sean Paul
"Bad Day" - Daniel Powter
"SOS" - Rihanna
"Ridin'" - Chamillioniare featuring Krayzie Bone
"Hips Don't Lie" - Shakira featuring Wyclef Jean
Senior
"London Bridge" - Fergie
"SexyBack" - Justin Timberlake
"Money Maker" - Ludacris featuring Pharrell
"My Love" - Justin Timberlake featuring T.I.
"I Wanna Love You" - Akon featuring Snoop Dogg
"Irreplaceable" - Beyonce
"Say It Right" - Nelly Furtado
"What Goes Around...Comes Around" - Justin Timberlake
"This Is Why I'm Hot" - Mims
"Glamorous" - Fergie featuring Ludacris
"Don't Matter" - Akon
"Give It to Me" - Timbaland featuring Nelly Furtado and Justin Timberlake
"Girlfriend" - Avril Lavigne
"Makes Me Wonder" - Maroon 5
"Buy U a Drank (Shawty Snappin')" - T-Pain featuring Yung Joc
"Makes Me Wonder" - Maroon 5
"Umbrella" - Rihanna featuring Jay-Z
= Song I adore
Such great songs...