Try using the textbook to understand the lesson - read carefully through the examples provided. (Precalculus online textbook)
Check out Kahn Academy - this website has great articles, videos, and practice problems for almost any topic!
Desmos - free online graphing calculator - can graph in rectangular and polar!
Math Clipart - this page has many math tools that may be helpful to you at home - such as blank coordinate grids.
Math is Fun - Puzzles - this website has many different math and logic puzzles - just for fun!