Each student must bring his own notebook and writing utensil?

The sentence is grammatically correct, but it could be improved for clarity and inclusivity. Here are some suggestions:

More inclusive:

* Each student must bring their own notebook and writing utensil. (Using "their" instead of "his" makes it inclusive of all genders)

More concise:

* Students must bring their own notebooks and writing utensils.

More formal:

* All students are required to bring their own notebooks and writing utensils.

Choose the version that best suits the context and desired tone.