To answer this, you need to provide the number of classes you have. Here's how to reply:
* If you have a specific number of classes:
* "Tengo [número] clases este año." (Example: "Tengo 6 clases este año.")
* If you don't know the exact number, but you know it's a lot:
* "Tengo muchas clases este año." ("I have many classes this year.")
* If you don't know the exact number and it's not many:
* "Tengo pocas clases este año." ("I have a few classes this year.")
Remember to replace [número] with the actual number of classes you have.