Aforementioned is all just common sense, and you might have heard about this earlier also. Still just writing to remind you again.
First things first:-
1. Believe in yourself:
Always have trust in your capabilities and calibre. You have the potential to achieve whatever you want. Never let anyone tell you can't do something, you got a dream, you've got to protect it.(pursuit of happiness famous dialogue)
2. Learn from your mistakes:
What we generally do is trying similar thing or way again and again which leads to unsatisfactory results. Do analyse your technique every time and find out errors/causes of failure then work again with full zeal.
An ant falls hundreds of times before reaching the top of the wall but never loses faith, hence succeeds
3. Dedication:
Whenever you study, give your best. Never use WhatsApp, Facebook, Quora and if possible avoid phone/laptop while studying. These things only distract you away from your goal. There must not come anything between you and your target. Study hard for it such that at the result declaration day when you face yourself in the mirror, you can see in the eyes and tell yourself, yes I gave my 100%.
4. Aim big:
Always dream big as bigger is the goal, larger is the efforts, hence bigger will be the success.
Yes I know I am not talking specifically about basic mathematics, but this practice is applicable for every task you perform. Do try this and tell me about the result.