"Emel benim en iyi öğrencim." Translation: Emel is my best student.
"Emel en iyi öğrencim." - Emel is my best student.
"öğrencim" - (possessive suffix) -im. Evet - yes the "benim" can be omitted.
& as Duo would say: You have a new follower "Emel" - What are you waiting for? She is Duo's best student.