1) "And one of them is that the e-book can get discharged" - правильно "And one of them is that the e-book can discharge".
2) "Besides, if you lose your e-book, you will lose all the books that were on it, which you wanted to read" - Я бы сказала "Besides, if you lose your e-book, you will lose all the books that were on it, which you WANT to read".
Всё остальное правильно, молодец!
Удачи на экзамене!