Knowing how to find relative and easy to understand answers is becoming more important than learning all the facts beforehand. Most of the current schoolwork can be made easier with internet - and knowing how to navigate the internet will be a very important skill when going into the job-market. Public WiFi is becoming more and more available across the globe with some even saying that internet access is nowadays one of the most important human necessities.
Therefore you can make your child's life easier and give them the tools that they need by providing them with a tablet for easy connection wherever they are. Younger children will do great with simple, easy to use and not overly expensive tablets. There is less fear of breaking the product, however at the same time they get all the chances to learn and develop. For older kids, to help them more in classes, it's best to go with a bit more expensive model, one which has not only WiFi, but also 3G or 4G connection, so that they can use the internet whenever they need it. The tablet would also have to have a battery with bigger capacity, in order to last for as long as they might need it.