Aspirants can gauge their preparation level for the UPSC Mains using several methods. Regularly taking mock tests that simulate the exam environment can help assess readiness and identify weak areas. Analyzing performance through these tests provides insights into time management and question selection. Additionally, reviewing feedback from experts or mentors can enhance clarity on preparation gaps. Peer discussions can also facilitate deeper understanding by exposing students to diverse perspectives. Keeping track of progress with well-organized notes and regularly revising topics further aids in evaluating one's preparation levels effectively.