Betsy Was a Junior/Betsy and Joe by Maud Hart Lovelace

Betsy Was a Junior: It's the best school year ever, especially now that charming, funny Tib Muller is back in Deep Valley. But when her crowd gets into trouble, Betsy's best year could turn out to be her worst.

Betsy and Joe: Betsy always thought she and Joe Willard were made for each other—and now that summer's over and senior year's begun, it seems her dream is coming true! But her friend Tony Markham has come calling as well—and his intentions are definitely romantic.