The difficulty with a book devoted to the important equations is that there is a lot of very complex mathematics which underpins those equations. To understand a lot of the equations in this book it would be helpful to know something about calculus or other higher level maths. Since nowadays you can do an A level in Physics without studying calculus it seems that this book can only be aimed at undergraduate students or people who have studied these interesting areas. Nevertheless, this book is a great inspiration to those who have an understanding of maths and want to develop it further beyond what they know.
These equations have had a remarkable impact on our lives and our understanding of the universe so it is great that someone is willing to sit down and explain them to us in a way that is not too abstract and technical. Like with most popular science books it is not important that the reader understand all the logical implications of maths, but to get some understanding of the general nature of these equations. When trying to understand these equations we have to start from somewhere and this book is a good place to start.