This is the 5743rd most frequent Polish word.
wysoką
"High" or "tall" in feminine form (accusative or instrumental case).
Here, 'wysoką' is an adjective in the accusative form describing 'ocenę', indicating a high level or grade.
Mam wysoką ocenę za projekt.
I have a high grade for the project.
In this instance, 'wysoką' describes 'wieżę' (tower) and reflects the physical height of the object being observed.
Zauważyłem wysoką wieżę w oddali.
I noticed a high tower in the distance.
The word 'wysoką' is used to modify 'lampę', signifying the object's quality of being tall or of considerable height.