this book is from physics wala foundation and it is concept and question bank from which you will get idea what type of question will be coming in your exams and there is some highlighted pages due to some reason I can't include here but don't worry the highlighted pages are also important which will help you in knowing the important topics as well so don't be afraid by this and you will be what it buying this due to this book my exam has gone well so I bought it for 1100 but I am selling this at just 600 rupees for both books