CHENNAI: Examination for the recruitment of 1,078 police sub-inspectors in the State Government is slated for May 23 and 24. To help those appearing for the exams, Career Choice, an NGO, is organising free classes for three days, from May 15. Classes will be held at World University Service Centre in Chetpet, from 8 am to 6 pm, and will cover maths, aptitude, general knowledge, speed maths, memory techniques and winning strategies. Call 9384844405/9282233333.