That's longer than I'd be comfortable leaving one bird on a regular basis. Can you consider getting two?
If you're a student, please bear in mind that your life will change - often dramatically - once you have completed your studies. Cockatiels can live for many years - there are a couple on this forum who are in their 30s. Please make sure that you've thought about how you can care for them as you navigate the changes and challenges of work, relationships, family life and so on.
Please also ensure that you have a vet fund. Avian vet care is specialist and can be expensive. There's nothing more heartbreaking than watching a pet suffer because you don't have access to an avian vet, or don't have the money to take them. If you are still living with your parents, this must be something that they're aware of and happy to pay for.