There were three months yet before the university entrance examinations.

Without laboratories, without coaching, sitting in my bedroom, I proceeded to compress that two years' work into three months and to keep reviewed on the previous year's work.
Nineteen hours a day I studied.

For three months I kept this pace, only breaking it on several occasions.

My body grew weary, my mind grew weary, but I stayed with it.

My eyes grew weary and began to twitch, but they did not break down.