In this case you have described I would suggest you should attempt the same paper multiple times, at least 3 times, and then look at the solutions to all the questions you have not got right. Make a tally of the mistakes and try to get rid of all of them till the last 3rd try.

Keep on repeating the papers, do not attempt same paper two times in a row though. For example there is paper 1 you have given on day 1, then paper 2 on day 2 and then paper 3 on day 3. After that repeat, paper 1 on Day 4, Paper 2 on Day 5, and so on.

You can also attempt two papers in one day as the time comes to end.

Hope this helps. Thank you.