While Sugar Sugar Rune is from the point of view of people that have magic that come to the Human world, Mamotte! Lollipop takes on the perspective of a human that gets wrapped up with people with magic because she accidentally swallowed what they were trying to recover. Both SSR and M!L include people that are taking a type "exam" while in the human world and both include nice amounts of romance though Mamotte! Lollipop focuses a bit more on it.
As one of the most popular girls in school, Ayu Tateishi is always concerned with her public image. However, she gets more than she bargains for when she helps a new student, Nina Sakura, retrieve a lost item. Nina is actually a witch from the magic kingdom, and the lost item was her electronic spell book. Intent on repaying her kindness, Nina decides that she can trust Ayu with her magical secret and offers to grant any wish she makes. Unfortunately, even though Nina's heart is in the right place, her skills are somewhat lacking. So when Nina temporarily turns her into a guy, gives her a ring that electrocutes any boy who touches her, and messes up a love potion, Ayu begins to regret ever picking the spell book up. Will Ayu's reputation and love life be able to survive their friendship, and will Nina ever improve her skills enough to return home?
Both Sugar Sugar Rune and Ultra Maniac are based around witches coming to the Human world (though for different reasons) and both also include very good romance. Hope you read and enjoy both :3