Using a Schaums Outline Series for self-guided study is well suited to the hard-working confident student eager to develop objective math skills, or review and reinforce a field that is already somewhat familiar. This approach might add a welcome structure and stimulus for high school and college students whose in-class math educations have been slowed down by the pandemic.
Schaums Outline Series are available on a wide range of topics, in paper and electronic formats. I have found them particularly helpful for math.
Purchases can be made online directly through McGraw Hill or other online retail outlets, and be purchased new or second hand. Here are some examples.
College Algebra
https://www.mhprofessional.com/9781260120769-usa-schaums-outline-of-college-algebra-fifth-edition-group
Geometry
https://www.mhprofessional.com/9781260010572-usa-schaums-outline-of-geometry-sixth-edition-group
Trigonometry
https://www.mhprofessional.com/9781260011487-usa-schaums-outline-of-trigonometry-sixth-edition-group
College Physics
https://www.mhprofessional.com/9781259587399-usa-schaums-outline-of-college-physics-twelfth-edition-group
Statistics
https://www.mhprofessional.com/9781260011463-usa-schaums-outline-of-statistics-sixth-edition
A Broader Look at McGraw Hill
The McGraw Hill webistehttps://www.mhprofessional.com/schaum-s
McGraw Hill Work with Educators During the Pandemic
https://www.mheducation.com/ideas/announcements/mcgraw-hill-update-support-for-schools-coronavirus.html
A Wiki Article About the Schaums Outline Series
https://en.wikipedia.org/wiki/Schaum%27s_Outlines