One big mistake in that book is that this book does not have the chapter required in bsf radio operatior for maths as in ro we require non technical maths but this books has chapter of technical maths like percentage, lcm and hcf , average, number system that is not required in ro we need chapter like complex number, algebra , calculus's , so update this books and bring good maths syllabus overall book is great but maths is completely not useful
