Hi  percentile depends on number of students appear in that slot and highest marks achieved and also in difficulty of paper  in that slot so this year there may be changes but according to previous year trend  for 120 marks you can expect  around 96 percentile .

Respected sir/ma'am
If your son is getting a score of 120 in JEE Mains then according to the previous year trends your son has scored above around 95 percentile. These trends change every year depending on the type of paper and number of candidates appeared and many other factors. Also please wait for the official results to be out.
Accuracy is what matters in JEE Mains entrance examination.

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