oceniti

1. to assess; to evaluate; to judge
   Stručnjaci su ocenili da je plan realan. — Experts judged the plan to be realistic.
   Kako biste ocenili našu uslugu? — How would you rate our service?
2. (at school) to grade; to mark
   Nastavnica ga je ocenila peticom. — The teacher gave him an A.
   Profesor još nije ocenio naše testove. — The teacher hasn't marked our tests yet.

The grade itself goes in the instrumental: oceniti koga peticom "to give someone a five".