At home, on the road or at work... OİSİF Boomerang Trainer Application is an application where you can earn additional income 24/7 by solving questions from students from anywhere you want. You can use our application for students and intermediate classes preparing for exams such as TYT, AYT, KPSS, AGS, MSÜ, ALES, DGS. Join our large family of Turkey's best teachers and support our students whenever and wherever you want!