how do you get from a c and b grade in biology to an A?

get a tutor!

FIRST THINGS FIRST. WHAT EXAM BOARD ARE U STUDYING BIOLOGY WITH AND WHAT BIOLOGY EXAM ARE YOU TAKING? I AM WITH AQA AND I DID B1 IN YEAR 9/10 AND DID B2 IN YEAR 10/11. IN B1 I ACHIEVED A B GRADE BUT WITH B2 I WANTED TO GET ONE BETTER. UNFORTUNATELY I WAS 1 MARK OFF AN A IN B2. THE BEST WAY TO REACH FOR THE HIGH GRADES IS TO UNDERSTAND EVERY TOPIC UNDER BIOLOGY AND TO PRACTICE ANSWERING EXAM QUESTIONS SO THAT YOU CAN ANSWER THEM PROPERLY AND GET FULL MARKS ON A QUESTION IN THE EXAM.