I've had Solving for M on my TBR for a long time now! Mika and her mom are used to things just being the both of them because her parents divorced when she was a baby. Her dad remarried soon after, and her mom hasn't yet. She's a new middle schooler and is enjoying her math class, although the new pod system in their school means she isn't in the same group as her best friend. Their math teacher is very engaging and asks the kids to keep a semi-private math journal for the math problems they will do during the school year. All is well until Mika's mom discovers a spot on the back of her leg, which turns out to be a melanoma.
The Amelia Six is the story of six clever girls who are invited to spend a night in Amelia Earhart's home because of their achievements in STEM (specifically flying and aeronautics). Although all big-time Earhart fans, each of the girls are different. There's shy, anxious Amelia (Millie) whose mom left her to go be a pilot. Then there are twins Robin and Wren who run a YouTube channel, Thea who builds things, like the side car she arrives in with her aunt's motorcycle, Nathalie and her pet rat and Cassie whose parents work at NASA.
The World Ends in April is author Stacy McAnulty's sophomore middle-grade novel. Her strong-willed protagonist Eleanor Dross's grandfather is a survivalist. When a renowned scientist begins to spread news of an impending asteroid hit, Eleanor gets caught up in end-of-the-world propaganda. Along with Mack she starts a survivalist club at school. The club attracts some unexpected members, including Eleanor's nemesis, Londyn. But as the kids prepare for TEOTWAWKI (the End of the World as We Know It), they learn more about each other and life than they expect.