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Please help me to check, thanks.

Peter was a Year 4 pupil. Science is the subject he likes the most. One day,

during the science (lesson), he was attentively doing an experiment in a laboratory.

Peter was in a group of three in the laboratory. When he was holding a test-tube (going to test the result), he accidentally slipped and broke it (on the floor). At that moment, he was very scared and did not know what to do.

His science teacher, Mr Lim, came to him. He helped Peter pick the pieces of glass and throw them in / into the dustbin. He just warned them to be careful next time.

Peter had learnt a lesson from the incident.
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Hi Vincent,

Peter was a 4 year old pupil. Science(1) was the subject he liked (the) most. One day, during a science lesson/class, he was attentively doing an experiment in a/the (2) lab.

Peter was in a group of three in the laboratory. While he was holding a test-tube he slipped(3) and broke it. At that moment, he was very scared and did not know what to do.

His science teacher, Mr Lim, came to him. He helped Peter pick up the pieces of glass and throw them into the dustbin. He just warned the pupils to be more careful next time.

1) Science is a broad field. Perhaps you meant chemistry. Anyway, a more natural way to write this sentence would be 'Science was his favourite subject'. Use the past tense even if science is still your favourite subject.

2) Use the if you're referring to the school laboratory.

3) You can omit 'accidentally' because it is assumed.
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IvanhrPeter was a 4 year old pupil.

It doesn't seem a right correction to me.

Regards.
ecopsy
IvanhrPeter was a 4 year old pupil.

It doesn't seem a right correction to me.

Regards.

You're right. I assumed that it was a reference to his age.