participant_id,before_score,after_score
P01,48,46
P02,57,61
P03,66,73
P04,75,78
P05,54,63
P06,63,63
P07,72,77
P08,51,59
P09,60,62
P10,69,75
P11,48,46
P12,57,61
P13,66,73
P14,75,78
P15,54,63
P16,63,63
P17,72,77
P18,51,59
P19,60,62
P20,69,75