Thanks for writing.
Congratulations on your decision to quit. Generally speaking. regular smokers would have nicotine
in their blood for 3-4 days after they quit. It should take about 1-2 weeks for the nicotine to clear from your urine. So as long as you stay quit, I think you should be in good shape before your pre-employment tests.
If you need any help for staying quit, you can call the local Tobacco helpline for help.