I read The Last Lecture on my own time and it was a great book! It's pretty short (good for those who don't like reading) and the pages seem to fly by, but it has so many great messages in it. I was surprised when our professor made us watch a clip in one of my classes last semester.
13 Reason's Why was great as well as the Hunger Games series. The Alex Rider series is also really good if you like action books. Neil Shusterman has some great books (Everlost, Undwind, Full Tilt); all have a weird plot with a twist but worth your time reading. There is a series out called the Maze Runner series (actually I think its a trilogy, but I'm not positive if the third book is out.) Anyways, I've read the first book, The Maze Runner, and it's very similar to The Hunger Games with the way it's written and the plot and even the dark themes. If you liked The Hunger Games, you'll like The Maze Runner. But, The Hunger Games will still always be my favorite.
Here's a tip for when you're trying to find a new book to read:
Go to Amazon.com.
Type in your all time favorite book or a book whose theme you enjoyed reading.
Click on the books page.
Scroll down to the section where it says: "Customers Who Bought This Item Also Bought" and look through those books. Chances are you will find a book in the same genre of the book you looked up. This is how I find most of my books and I find so many books I have made lists of 20+ books I want to read.