Unfortunately, I do not have access to real-time information, including specific school exam schedules. To find out if your Class 8 Geography half-yearly exam is today, I recommend checking these sources:

• Your School's Official Website or Calendar: This is usually the most accurate source for exam dates.
• Contacting Your School Directly: Call or email your school's administration or your Geography teacher.
• Checking with Classmates: Ask your friends in class if they have any information about the exam schedule.

Good luck with your exam preparation!