BERLIN: Bilal Kreidi, a 16-year-old Syrian student based in Germany, has won first place nationally in the Mathematical Kangaroo, one of the world's largest mathematics competitions, which drew more than 881,000 students from over 12,600 schools across the country. The achievement did not stop at the podium. Bilal has since launched an educational TikTok channel where he posts simplified math lessons spanning five levels — from fifth grade through to advanced secondary — earning widespread popularity among students struggling with the subject.