I have passed 12th this year from CBSE and got very less marks especially for maths.I have only 35 marks for maths which i can't go for any professional course.I wish to write the improvement exam for maths only.But if i am improving for maths then will i be able to write the All India medical entrance???If i am getting less mark for improvement exam then will i get my old mark.If i am writing physics and chemistry then i want to do practical one more time or will i get my old practical mark??If i am registering fro entrance then i need to write my improvement exam"s rollno or appearing or my old marks???