Well I'm also considering double major and let me share tips I heard. First you will have to be super dedicated. Use your time wisely don't waste it on games or movies. Second there might be a schedule mix up on test. It's common don't panic just prioritize one. Mostly extension tests can be retaken if you pay a certain amount of money and have a good enough reason. Third Double major may not be really necessary. Esp if it's CS you want you could take courses online and esp learn different programming languages. If you want the knowledge more than the paper, learning by yourself would make u a better programmer. Our university curriculum for CS teaches mostly outdated and old programming language, framework and everything. And unless you have a clear goal in mind studying two unrelated fields isn't a good idea dude. But if you have a plan on how you'll use both professionally very good then.