Md. Arifuzzaman, widely known as Mentor Arif, is a defence instructor with over 14 years of experience. He is the founder of Green Defence Academy, Green Soldier Academy, Green Academy, Green Hat IT (an IT training institute), iqtestbd.com and Defence Prokashoni. Over 1,000 of his students have successfully joined the Bangladesh Army, Navy, and Air Force. He is the author of Army Preparation Guide, Navy & Airforce Preparation Guide, Soldiers Guide, Sopno Jokhon Ronangone and continues to write valuable resources for aspiring candidates. He has conducted seminars at top colleges and psychometric tests for NovoAir, US-Bangla Airlines and Galaxy Flying Academy. He now reaches thousands across the country, specializing in officer recruitment and ISSB preparation, with a mission to guide and build the future military leaders of Bangladesh.