How many different things can you say can help improve your life? If you think about this, it is impossible to say which one will help. There are no tests that tell you whether the product helps you. In fact, there are no tests at all. You must find out for yourself, in your own way, which product works best for you, based on the type of stress you are facing. If you find that one specific product doesn't help, don't give up, you can still try a different product. It all depends on how many other products you have tried. You can try different things in case you find one you like and think that you have found a product for stress. If you have tried a lot of them, you will likely find that one of the above products works best. If you don't like it, then you can always try something else.
The next question is how many tests is it worth for you to take. First of all, the test of stress is an emotional one. If you take a test that doesn't make you feel good, it may or may not help you in your work.