I partly agree with this opinion due to the following reasons.
- Good measured response, lacking a clear thesis presentation though. Rather than "the following reasons", providing 2 topic sentences to show the upcoming flow of discussion in the 2 reasoning paragraphs would have created a clearer preliminary explanation and stronger opinion statement.
I realize that some teachers prefer to have students use memorized phrases to help them write their sentences more easily. However, these useless phrases (On the one hand, on the other hand, In conclusion) do not help to increase any part of your scoring requirements. Which is why a new presentation of the topic sentences, or proper sentence introductions to the topic of the paragraph will always help you score better. Clarity is always better in any part of the essay presentation. That is something you cannot achieve by using memorized phrases.
You forgot to reiterate your opinion in the concluding statement. You could have used that reiteration to effective close the paragraph rather than using the memorized phrase, "In conclusion". You could have instead said something like:
These are the reasons why I can only partly agree with the idea that...The examiner will know that it is a reference indicative of a concluding summary. Why? The total paragraph will repeat all the required information in short form. That, is all the concluding summary requires and that, is what he should read in the presentation.