He has done everything he can to prepare for the exam, and now he is in a state of 'doing all that is humanly possible and waiting for fate to take its course'.

He exhausted all his strength to finish the job.

He exhausted himself by working to the limit.

He is devoting himself to his work.

She was devastated by sadness and cried her eyes out all night.

I did my best for the exam.

He used every possible means to make the project successful.

He ran with all his might.

He is too deeply involved in other people's affairs.

He is the head of the human affairs department.