Manjusri is a figure in Buddhism who represents wisdom and knowledge. He is often depicted in artwork riding on a lion, and holding a sword and a book.
Imagine you have a big test coming up and you need to study a lot so you can do well. Manjusri is like a really smart friend who can help you study and understand things better. He uses his sword to cut through confusion and his book to show you the answers to your questions. He also rides on a lion, which represents strength and courage, so he can help you feel brave when you're studying.
People who follow Buddhism might pray to or meditate on Manjusri when they need help with school or any kind of problem that requires wise thinking. They believe that by focusing on Manjusri, they can become more wise themselves and make good decisions.