To prepare for the BSNL TTA (Telecom Technical Assistant) exam, begin by thoroughly understanding the syllabus and exam pattern. Collect quality study materials and books specific to the topics covered, focusing on sections like General Ability, Basic Engineering, and Specialization. Create a well-structured study schedule, allocating time for each subject. Prioritize your weaker areas, solve previous year's question papers, and take regular mock tests to assess your progress.