I am the first on Earth, the second in Heaven. I appear two times in a week  you can only see me once in a year. Although I am in the middle of the sea, l am not found in month, but l am in February, June, September, October, November & December. What am I?
I am very good in math and physics. I am able to solve hard problems easily. However, in exams, I fall prey to easy questions that require just a different thought process that doesn't appear to me quickly. How do I overcome this problem and unleash my full potential?