Боюсь,что к концу дня он слишком ус

Боюсь,что к концу дня он слишком устанет,чтобы работать со словарем.
Студенты первого курса сдадут экзамены к первому июля. До начала экзаменов они напишут несколько экзаменационных работ и сдадут все зачёты.

Результаты (английский) 1:

I am afraid that by the end of the day, he's too tired to work with the dictionary.First-year students pass the exams to the first of July. Prior to the commencement of the examinations they will write some examination papers and pass all tests successfully.

Результаты (английский) 2:

I'm afraid that by the end of the day he is too tired to work with the dictionary.
first-year students will pass the exams for the first of July. Before the start of the exams they will write some examination papers and hand over all the competition.

Результаты (английский) 3:

I'm afraid that the end of the day, he too gets bleary eyed from all,in order to work on the dictionary.
the first course students sat examinations in the first July. Prior to the examination they will happily write a few test exams and depositing all thrown away.