YOU SAID:

now I'm home and I should grade at least some 10 projects and prepare an exam

INTO JAPANESE

今私は家にいて、少なくとも10個のプロジェクトを採点し、試験の準備をしなければなりません

BACK INTO ENGLISH

Now I am at home and have to grade at least 10 projects and prepare for exams.

INTO JAPANESE

今私は家にいて、少なくとも 10 件のプロジェクトを採点し、試験の準備をしなければなりません。

BACK INTO ENGLISH

Now I am at home and have to grade at least 10 projects and prepare for exams.