How do I make a realistic daily timetable for Class 12 boards without burning out?

Build the timetable around how you really study, not an ideal version of yourself. Work in focused blocks of about 45 to 50 minutes with 10-minute breaks, and aim for four to six such blocks a day rather than vague twelve-hour goals you will abandon. Assign each block a specific task like solving ten integration problems, not the vague subject name. Keep one subject you find hard in your freshest morning slot and lighter revision at night. Leave one flexible block daily to catch up on whatever spilled over, which prevents guilt-driven quitting. Schedule one lighter day a week and actual sleep of seven hours, because exhaustion destroys retention. Review and adjust the plan every Sunday based on what actually got done, so it stays realistic instead of fantasy.