The phrase "activities in school" is correct and usable in written English.
It can be used whenever activities that take place at school are being discussed, such as in: "The students had many interesting activities in school this week, including lessons in science and art."
Students from low-income families who take part in arts activities in school are three times more likely to get a degree.
"Hoosiers" (1986): A man, believed to be the actor Gene Hackman, is at the center of this eerie mystery set in the heart of Middle America, where unknown activities in school gymnasia are causing celebrations among locals.
In seventh grade, he said he trembled to hear a school principal announce over the loudspeaker that anyone who knew about homosexual activities in school must report them immediately.
The Chestnut Centre, with its owls, otters and deer, is 15 minutes' drive away, and the Gathering arranges family-friendly activities in school holidays, from nature walks to arts and crafts and egg collecting.
Among other changes, Wirt's system led to greater emphasis on recreational and vocational activities in school, lengthened school hours from six to eight, created class levels based on age, and encouraged teachers in subject-area specialization.
Given the importance of problem-posing activities in school mathematics, some researchers have investigated various aspects of problem-posing processes.
School officials in Minneapolis, Iowa City and New York City also changed some of their policies regarding Boy Scouts activities in schools.
Saheliya runs outreach activities in schools and the community to spread awareness of forced marriage and of the support available.
Wenzhou, a city in the wealthy eastern province of Zhejiang, has banned all Christmas activities in schools and kindergartens, the official Xinhua news agency reported.
But I must take exception to the assertion that parents should work to improve the quality of the food and sports activities in schools.
DCMS statistics already evidence that participation in arts activities in schools is dropping, with participation in music activities dropping from 55.3% to a worryingly low 37.2% between 2009 and 2013/14.
