Rearrange the following sentences in their correct order to form a meaningful paragraph.

(P) Tom's weakest subject was Chinese.

(Q) So, for the past half a year, his mother had engaged a private tutor to give him supplementary lessons to brush up on his Chinese.

(R) This was his first major national examination and they both did not know what to expect.

(S) Mrs Tan was feeling a lot of stress because her son's examination was approaching