KiraKira★Study ~Zettai Goukaku Sengen~

Misaki Marei is a second year in high school, and she sucks at studying. She has no real goals in life, and has zero interest in taking the college entrance exam...until her childhood best friend, Micchan, says she's going to college. Now Marei has found her goal: pass the entrance exam for Akamon University, an elite college, and go to school with Micchan.

(tagged both shoujo ai and yuri for now because it's not clear to me which is accurate / more accurate. several Japanese Amazon reviews of this manga mention "yuri", but we all know there's no distinction made in Japanese)