Dear Saad
Your ambitions are appreciable, May Allah succeed you with flying colours in the examinations. If you want to secure TOP position in your class, you need to have a proper revision of the subjects and a good drill of the Mathematics exercises. When you have learnt any topic or article, try to put that down in your practice book before jumping over to another topic. Insha Allah you will get distinction marks in all subjects but it's my advice not to compete with any of your classmates as to gain knowledge is itself an great achievement and no one can ever beat you if you have got command over that particular topic/concept/branch of knowledge.