You were enrolled in an intensive English course because you were bad at the language?
Yes, of course. Intensive English courses are for people who need to improve their English.
That said, I share the concern that much of this essay, in its concern with the minutae of your GPA, is beside the point of the prompt.
But this is one instance where we have to look at grammar before we can even think about content, because the grammatical errors are so frequent and glaring that they inhibit the comprehensibility of the essay.
Here is a piece of advice you may or may not want to hear: If you hope to get into a school like Purdue, you must -- absolutely must -- attend carefully enough to your grammar so that, at minimum, you consistently use proper verb tenses. You can get away with some errors, but errors on this scale mark you as unready for university-level study conducted in English.
So, you will need -- quickly -- to change this attitude:
I did not score well for the only major subject which is quite easy.
English was your only major subject. English is not easy for you. You will need to work hard on English.
Start now. Go through this essay and put the whole thing into
past tense. Do not use the present tense of verbs unless you are writing about something that is currently or still happening. You
had lots of free time in your time-table; you start
ed to play computer games; etc., etc.
Post a revision and we'll see what we can do.