Are there any mistakes in these sentences?

[Angelwings]

1. When it is Joan’s turn to answer a question, she has to be prompted because she doesn’t realize that it is her turn.
2. Tom should spend more time studying Geography so that he can achieve better results.
3. If Mary is finding it difficult to study the French version of the science workbook, I can print her the English version.

[Torsten]

@Angelwings

When it is Joan’s turn to answer a question, she has to be prompted because she doesn’t realize that it is her turn.

When it’s Joan’s turn to answer a question, you have to prompt her because she doesn’t know it’s her turn.

@Angelwings

Tom should spend more time studying Geography so that he can achieve better results.

Tom should spend more time on geography lessons to get better results.

@Angelwings

If Mary is finding it difficult to study the French version of the science workbook, I can print her the English version.

If Mary has trouble learning the French version of the science workbook, I can print out the English version for her.