Is bunch of student correct English?

"Bunch of students" is not grammatically incorrect, but it is not the most common or preferred way to describe a group of students.

Here's why:

* "Bunch" is more informal: It's often used for things like grapes or flowers, making it less formal than other options.

* "Group" is more formal and precise: It clearly indicates a collection of people with shared characteristics.

* "Class" is specific to education: It implies a group of students studying together.

Better alternatives:

* A group of students

* The students

* A class of students

* The class

Ultimately, the best choice depends on the context and level of formality.