I had type 2 diabetes and my blood sugar level was always above 8.0. now its 6.2 due to exercises. do i still need medication?

Maybe, however...: Congratulations! it's great that your glycohemoglobin is now in the normal range with exercise, but it sounds like you are also on medication & your sugar may go up if you stop. A healthy diet is also important. Supplements like chromium, lipoic acid, cinnamon, gymnema sylvestre & aloe extract can also help. Don't stop meds without consulting your doc but diet, supps & exercise might be enough!

A1c or glucose?: Are your numbers a1c values? Or glucose levels? Glucose of 8.0 mmol/l would be 144 mg/dl, and 6.2 mmol/l would be 112. Target blood glucose levels for many people with dm are 80-120. In either case, if you are in range with meds, it is likely you would run higher without meds. Talk to your doctor about your meds- some may be providing benefits beyond lower sugars, and should be continued.