Thank you for viewing. This is a 2021 edition of the Denken 1st Class Model Answer Collection, containing all questions and explanations. Denken 1st Class Model Answer Collection Publisher: Denki Gakuin Published: 2021 edition This is a collection of past questions from the 1st Class Electrical Engineer examination, commonly known as Denken 1st Class. It includes past questions from the 5 years between 2016 and 2020. Only the second-stage exam for 2020 is not included. I purchased various materials for studying, but I ended up not using this one. It's in the same pristine condition as when I bought it new, with no writing or folds. There are no pets or smokers in the house. Thank you.