I am preparing for ssc cpo exam, In which I have qualify it's physical exam to pass. I have to clear 1600 meter running in 6 minute 30 sec. For this I practice I run almost 2 km and do exercises stretching. But its been 1 month I am suffering from shin bone pain it was light initially but when I ran on road one day it increased. And for the last week its continually creates problems while I workout or running. I also have problem in my knee. It's not that much but it surely debilitate my running and exercise. I am worried if this is a measure problem or common. Some people suggest me rest I tried that also but in resting period pain gone and when I run it comes back. I do not want to quit this physical exam. As, This is my last hope. Kindly suggest me if I should take any medicine or precautions or anything you want to suggest me so that I can clear this without any measure injuries. Thanks in advance.