Here you can find 10 examples of exhibitions with examiner's comments provided by IB.
Example A https://xmltwo.ibo.org/publications/DP/Group0/d_0_tokxx_tsm-asw_2003_1/en/tok_exhibition_A_en.pdf
Examiner's Comment https://xmltwo.ibo.org/publications/DP/Group0/d_0_tokxx_tsm-asw_2003_1/en/tok_exhibition_A_en.pdf