I must find out what I must do in order to finish all them hard subjects!

The only thing that I pray to God about right now is to have a powerful brain because
One of the subjects that I right now am really hating a lot is Math and the second will be
Science and oh btw I have 2 sciences and three maths O.o now how do I
Turn things around? And also about my ambitions, there's something about my ambitions
That always gives me that reply, not just what I hear from my friends and family but also in my head that says
HA! Impossible... I need help and for that also I'll post here my gratitude list.
(My gratitude list)
I am grateful for my healthy relationship with Mira
I am grateful for all my friends in the Internet and school
I am grateful for my school
I am grateful that I have finished my 2nd year and third year
I am grateful for my relationship with my Father in
Heaven
I am grateful for my talent of Poem writing and writing
I am grateful for my healthy self
I am grateful for the Computer I have
I am grateful for the future shown to me by inspiration
I am grateful indeed for my life
I am grateful for meine Familie
I am grateful for such room I have here
I am grateful that even though I´m in the verge of fall
My Father in Heaven in always there
I am grateful for Michel Thomas and all the things I learn
I am grateful to have mastered the German language
I am grateful to have mastered the Italian language
I am grateful to have mastered the Polish language
I am grateful to be accepted in all the things I do
I am grateful that I will have gone to where she is
I am grateful for the white skin I have
I am grateful because I am a Christian.
I am grateful to have accomplished all that I must do in life.
I also have a vision board sticked in a wall of which whenever I wake up I always see it
What else should I do? How do I turn everything around? From problems to accomplishments?