I am not aware of any scientific study to prove the efficacy of schools organising night studies, but they must be a great psychological comfort for students as they chiong for the national exams.
The school would be open till night time and curry puffs and other light refreshments would be provided. Teachers would roster to stay back and be available for consultation.
There was a sense of community as the students bunkered down in the remaining months before their future was decided. Night study is better than solitary study. You have your friends around you in a structured environment.
There was one year, on the last night of Night Study, all those who stayed behind took a group photo. They were about to face the dreaded National exams.