There is no set number of TISSNET 2023 sample papers that could be recommended for you to solve. You must try to solve as much as possible to ensure the best preparation. You can use the sample papers to strategise your preparation. They can be placed at different intervals for different purposes. The number of sample papers shall differ according to the preparation stage.
Yes, you can solve one TISSNET 2023 sample paper twice. There is no limit on the number of times that you can solve sample papers. You simply need to ensure that each attempt helps you. You can use one attempt to assess your topic status. Your second attempt can follow as a scoring attempt, and you can use the third attempt as final practice or as practice for the actual exam.
There is no compulsion for you to mark your TISSNET 2023 sample papers, however, it is strongly recommended that you do so. Though this practice can be postponed for the second stage of preparation, that is once you are done covering your syllabus and strengthening your weak topics.
The difference between the TISSNET 2023 sample papers and the TISSNET 2023 mock test is that the sample papers are free to use. You can opt to not score or time your sample papers, however, this option is unavailable in mock tests. They are timed the same as the actual exam and scored as well.