"I got a very high score in my last test, Mum," she said
=> She said her mother (that) she had got a very high score in her last test.
ct:
S + said/told + O + that S + V (lùi thì)
( từ last không biến đổi được bạn nhé, ví dụ: khi nào là last week thì mới biến đổi thành the previous week)