Sonali.
I was in even worst situation with you. If you hear my marks for CA Final Group II, you will cry definately. I would not advise you to quit your CS rather, I would like you to take different approach which you consider appropirate.
Whenever you feel that something bad happened to you, you just see case of a person to whom something worst happened to you.
Most important thing.... never let your self down by quitting anything... your determination is your strength.. for CA/CS/CWA courses the story is the same.
Fight your way out... and keep your motivation level always high... and dont see your friends who got pass. you never know that you can become CS before them.