at the top
prep. phr..prep. phr.. In the highest part of something. It can also mean being the most successful or important in a group or field.
prep. phr.. A prepositional phrase indicating the highest physical position or the most successful or senior rank within a hierarchy.
The bird is at the top of the tree.
She worked hard for years and is now at the top of her profession.
The view from the chalet at the top of the mountain was so sublime it silenced even the most talkative hikers.
Often followed by 'of' to specify the location or hierarchy, like 'at the top of the stairs' or 'at the top of the company'.
Contrast the literal, spatial meaning ('at the top of the page') with the figurative, hierarchical meaning ('at the top of her game'); both use the same structure.
She is in the top of her class.She is at the top of her class.Use 'at' for a specific point or position, whereas 'in' is typically used for an enclosed space.