Class is back in session for thousands of city students attending summer school.

Children began arriving Thursday morning at PS 186 in Bensonhurst.

Some of the students in attendance didn't pass their grade, while others are there voluntarily to work on different programs.

A little more than 15,000 kids will be in summer school this summer. That's a sharp decline from 2013, when more than 32,000 students had to attend summer school.

Students will be in class about six hours a day. 

The 2018-2019 school year begins on September 5.