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...