He is majoring in belles-lettres.

He lost his sense of direction.

He is studying hard to enter the next level of school.

My younger brother will enter the faculty of law next year.

He commutes to school by bicycle every day.

He decided to drop out of school due to the difficulty of his studies.

My younger brother will enter the engineering department next year.

He is a world-famous mathematician.

He is an expert in electrodynamics.

Demography is a branch of social science that studies the structure, distribution, and changes in human population.