IDP IELTS — IELTS evaluation system not transparent

I feel the evaluation system of reading and listening tests should be transparent to the candidate because candidate can get complete idea about the wrong answers and can easily check against the correct answers if at all correct answers sheet (alongwith feedback/justification of why it is right) is provided with the result report.
Also, hybrid model can be adapted in Lieu of high omicron cases. For example speaking test could be allowed virtual and remaining tests can be organised on the same day in person.
Also, I would like to highlight the amount of time supervisors take to provide or take back papers in paper based examinations is not fair.
Answer sheets can be placed prior to candidate arrival.
Additionally, candidates shouldn't be stopped at any point in between test to use restroom.
IDP should consider the health risks of the Candidate on that particular day if at all they need to hold for long.