Непонятно что нужно вообще сделать

Dear mary, i decided to drop you a line to inform you, that i won't be able to write you for a while. soon me exams will begin and i need to run over a lot, to be sure that i will be able to pass as much as it is possible.this exams are very important, because results can determine will i go to coledge or not. as you see. i really shoud do everything what is possible. if i do everything good, i'll be able to choose colledge which i want, and if i don't pass i'll need to pass exams again or go to colledge that is far away from my house. i mustn't spoil everything. in any case, after exams, i'd like you to come and stay with me at the weekend. we could be together with each other and have fun together. can you come for the weekend on 20th of july? let me know. now i shoula go and start repeating. talk to you soon. with love, christina