Most common UK student visa refusal reasons for Bangladeshi applicants: (1) Financial proof issues — large deposits close to application, unverified sources of funds; (2) Previous UK immigration breach; (3) English language scores below course requirements; (4) Inconsistent information across documents; (5) Weak career narrative. To avoid refusal: consolidate funds 3+ months before application, use a regulated OISC adviser for complex cases, and ensure all documents match exactly in name, DOB, and address.