If you want to attend classes, but don’t enjoy waiting until they end, just fast forward a few hours. If the sun makes your skin sparkle (like Edward Cullen) and you aren’t a fan of that, make it rainy and gloomy. Basically anything you can imagine is real (or at least the available in-game stuff), so you can do anything and spawn anything that you want. 
To do all that, click on the gear (settings) icon in the top left of your screen and there the options vary from outfits and accessories, to whether or not you like seeing blood when committing murders.
Here, you can choose from options such as: changing the weather, adding a random object (really any object in game, weapons included), adding a random weapon (only weapons), changing the time, changing how you control the game and customizing the character.
Another option available to you is the fast teleport. You can go to the selected location just by tapping on the option you want. There are many available locations, each to satisfy all your lazy needs (since you’re not walking there and instead you take the short way in). All these places are on the school premises, so if you want to go home and change the bloody outfit and greet your cat, teleport to the Entrance since that’s the fastest route.