Is it common for undergraduate students to feel overwhelmed by the reading assignments? How to deal with it?
You don't need to read from the first word of the title to the last word of the conclusion. You should learn how to skim through the large materials. Use a highlight marker to highlight important sentences, terminologies, dates.

If you find it the text lengthy, try replacing it with online videos or similar shorter texts. A book can be replaced by a single research article.