Use of on vs in

Barbara, 

'On' is used to talk about when something is located on the surface or on the outside of an object or thing.  (The keys are on the table.)

It is also used to talk about timing of events. (My appointment is on Tuesday.)

'In' is used to talk about the location of things that are surrounded by objects. (The keys are in the bowl, on the table.) OR (John was in his pajamas before eight PM.)

It is also used to talk about participation in events. (Mary was in the play last weekend.)

I hope this is helpful.

Kim

Which is correct here:

1). Your scores have been low in several of your last lessons.

2). Your scores have been low on several of your last lessons.