The Fast Track to Mastering Extra Class Ham Radio Math: For exams administered July 1, 2016 through June 30, 2020 (Fast Track Ham License Series)

I really like the way these books are laid out. Easy to understand and follow. He explains the “why” which is something that helps me learn. Much better than the ARRL books.

Great book to help you get ready for the Extra test.

Descriptions on why formulas are used do not flow well though in the end the simplified equations work well.

very useful for my future test