The Trials of Apollo Series by Rick Riordan

THE BOOK

You will get to the Tiber alive. You will start to Jive.
The former God Apollo is having a pretty rough time of it. Well, for one thing, he's called Lester.
But being an awkward mortal teenager is the least of his worries. Though he and his friends (some of them) have emerged from the Burning Maze, they still have a triumvirate to defeat, oracles to rescue, and prophecies to decipher, so that the world may be saved, and Lester can become Apollo once again.

Skill Builder by Penguin Random House India

The Skill Builder series aims to foster in children the numerical, logical, thinking and language skills that are essential for success in the twenty-first century. The books are broadly aligned to school curricula
and are available at four different levels of complexity, so you can choose the one that best suits your child’s learning stage.