Whether they are accurate? Depends, no way for us to tell, you will need to double check them with someone elses kits (like the LFS
I'm not crazy about aquarium pharm kits as a general rule, but for ammonia and nitrite, I think there fine, IMO
all you really need for those after your tank has cycled is a yes or no test, the exact numbers are not as important as simply knowing that it's there and you have a problem. Also, you should not get much variance in those tests, ph
and nitrate might fluctuate a bit, but ammonia and nitrite should always be 0.
For other tests, I would use salifert kits.