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Hi there,
There is a great resource from ICRC about the way to conduct pumping tests;
https://www.icrc.org/eng/assets/files/publications/icrc-002-4033.pdf
The pump should be set within the solid casing to protect it in case of collapse of the well. The screen is not as strong as the solid casing so is more at risk. Make sure the well is developed before testing to reduce the risk of collapse.
Have fun and good luck!