Here, we've curated resources to help you refine your grammar skills.
Purdue OWL (Online Writing Lab) is a world renowned resource for professional and academic writing. Below are resources best-suited for English studies, separated into bite-sized chunks.
How to Use Adjectives and Adverbs
Making Subjects and Verbs Agree
For the audio-visual learners, follow this link to a playlist of grammar and mechanics tutorials.
Each video is approximately 5 minutes or fewer.
Purdue's sharing permissions on YouTube prohibit us from posting the videos here.

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Though a small book, Strunk and White's The Elements of Style is probably one of the most helpful books on writing there is, whether you're a Freshman or a Graduate student.