You could benefit from a computer correcting ”math's "(sic) test and other punctuation issues.
There is nothing wrong in using a calculator in certain aspects of maths tests, they are an everyday tool in life and they need to demonstrate knowledge of how to use it.
The PISA literacy tests are in their native language,it's a test of literacy. Thailand also fails very badly in separate measures testing English - the worst in ASEAN I understand,which is astonishing given the size and importance of their tourist trade.