Higher January 2021 Paper 2 Q13

13 \(P\), \(Q\), \(R\), \(S\) and \(T\) are points on a circle with centre \(O\).

Diagram NOT accurately drawn

\(QOS\) is a diameter of the circle.

angle \(POS = 124^\circ\)       angle \(PRS = m^\circ\)       angle \(PTS = n^\circ\)