Student Talk / So my speaking and writing skill is considered low, and i need some advice, BUT [3]

Im indonesian and im obviously wasn't born with an english tounge, and that's not the saddest part, im in a boarding school
(Basically, you live in the same place as your school, here, electronic devices are super limited, so learning and speaking english is really hard (and rarely in my school the students speak english daily))
And i must get a minimum score of 8 in ielts, what should i do?
i've tried bringing english novels/ books, but still, my vocabularies are still not broad
Fortunately, in the class, the teacher often explain in english.
Sorry for any grammar mistakes here, im really thankful if someone give me some tips/advice