Let me tell you something which probably you did not know. That you are just born on the Zodiac Cusp. that is someone who is born when the sign are about to change. With the time of 22:00 you are a Leo and with 22:01 you are a Virgo. So that is what I say when I say that you are born on the CUSP. Therefore you would have traits of Leo and also Virgo, but for marriage at a later stage you should know your correct time because 22:00 would make you Manglik and the 22:01 would not make you manglik. Right now it is not required but certainly later on.
As I can make out you are getting distracted in your educational efforts and not been able to perform to the very best. You are thinking too much during this period and that is not letting you relax. Mercury is the planet for knowledge, confidence, memory and Mercury is debilitated in the Navamsha chart. Doing the Remedies for Mercury will truly help you in your education and studies.