Chapter XII: Guns and Good Company.
Lewis passed his exams and was admitted into Oxford. He had to pass a basic mathematics test and he was terrible at it. He basically couldn't add well. Luckily for him, after the war students were exempt from that test. During his first term at Oxford, he was called into war and on his 19th birthday arrived at the front lines. He doesn't take much about war except to describe a bit of its horrors and the people he served with.
Chapter XIII: The New Look.
Lewis returned to Oxford and began his studies. He describe several of his friends and the impact they had on his life. His early beliefs were being changed as a result of those friends. "And so the great Angler played His fish and I never dreamed that the hook was in my tongue."