Sometimes there are tests and we do not pass them. It means that we did not do our homework! Before a test, if you did not do your homework then you might fail the test even if it is within your capacity to pass it. In that way, we may fail certain tests.
If we have the means and if we carefully take shelter of the process of Krsna consciousness, then we will not fail our tests. But if we are not careful, inattentive and do not take shelter properly of the process of devotional service, then we might fail our tests and we might feel that so many tests are too much for us!
As soon as you start to take to the process of devotional service – even if you fail in devotional service, even if you fall down from the process or deviate from the process, then there is no need for any atonement, since all you have to do is immediately take up the process again and immediately you are situated again on the path. There is no loss!