Have you ever been stuck in your school works? Here is my simple tip #1. Using your computer or mobile phone go to this website https://www.coursehero.com/

In this website, you can find some study guides or resources, class notes, textbooks, solutions, and more. And also, the Course Hero website is a 24/7 homework helper, you can access 400 million course-specific  study materials. It is really good for educators and you can also earn free access to get some source of answers.
 
For more questions, just visit and subcribe the YouTube Channel of Course Hero 
https://www.youtube.com/user/CourseHeroVideo