Firstly, Taking the material which the top priority, I am quite impressed with the efforts made to mention the solutions. Very relevant and easy understand. Also, it helps you in understanding the concept. Well done guys!!
Secondly, the condition which is not very important, was OK. Book could have been Colored for better visibility, but that is not mandatory, cost is also important.
At the end, it's a very good option for practice purpose and best part is, all questions are well answered with proper solutions.
Well, the product is damn good. The publication has covered all the IES question papers with brief and easy solutions till 2020. The paper quality can be improved as it has very low thickness and sometimes easily teared.
I rate 4/5 because of price. The delivery was quick and nice. However, I found it more cheap on another place so I had returned back. Again, the return and refund was also appreciable.