Here is some tough love from an English professor that is worth passing on to native speakers, whether still in college or out in the workforce:
Everything one needs to know to use the language clearly, correctly, and even stylishly is available in thousands of places, often free and rarely at a price of more than a few dollars. The nation is full of secondhand bookshops where $15 will get a used dictionary, an old copy of The Elements of Style, and a grammar handbook. Learning to write and speak clear, standard English is mostly a question of will. Some subjects require face-to-face instruction from an expert and hands-on practice under expert supervision. But when the subject is one’s own language, ignorance is a choice.
In some ways this idea applies to non-native speakers too. While you might need classes with a teacher, you should also study a lot on your own.