He ought to find a lift to increase or create a building that has fewer layers. Students will be able to use the stairs instead and will keep on studying doesn't have to wait too long lift stand.
Should be used to increase lift. Or a building that has fewer layers. Students will use the stairs instead and will not come up the elevator without waiting too long.
Should find more lift, or building with less number of layers Students will use the stairs instead and will in time to learn not to wait for the lift too long.