Platforms like Testbook, Unacademy, and Insights on India offer online UPSC mock exams that simulate the real examination environment. These platforms provide features such as interactive quizzes and performance analytics, assisting candidates in identifying strengths and weaknesses. Additionally, some apps and websites offer sectional tests on specific subjects, allowing aspirants to focus on areas needing improvement. Regular practice through these mock exams builds confidence, improves time management skills, and familiarizes candidates with the exam format.