"Tokyo Tech Chemistry 20 Years [4th Edition]" Kyogakusha Editorial Department / Fumio Ibe / Fumio Ibe Price: ¥2300 #KyogakushaEditorialDepartment #FumioIbe #Fumio_Ibe #FumioIbe #Fumio_Ibe #Book #Nature/Chemistry As shown in the photo, there are pencil check marks on the problem numbers, but there are no markings on the problems themselves, and I think it will not interfere with solving them. There are markings with fluorescent pens and red pens in the answer section as shown in the photo, but I think it's good because you can understand the points. I successfully passed Tokyo Institute of Technology on my first try with this. Please use it as a lucky problem collection Ϛ⃘•͡ .̫•꒜✧