The Lord will never allow us to be tempted above that which we are able to bear (1Cor.10:13), but He does allow the Devil to test our faith to see if we'll really flee to the Lord and His Word and take a stand of faith.
With every grade, the tests get harder and the choices more difficult! The more God can trust you to stand the test, the tougher it's going to be. But no matter how great your trial may be, if you have faith to trust in God to bring you out of that difficulty, you won't murmur or complain! You'll rejoice and praise God and thank Him, even for the trial, because you know He is able to save you!--Like Job! Job endured his suffering to prove his faith and his love of God. And when Job passed the test and gave the final right answer: "Though He slay me, yet will I trust Him," he got his diploma! (Job 13:15)
God allows tests and sufferings not only for Him to see if we've got faith--which He already knows--but also for US to see if we've got it and for others to see if we've got it! It's a testimony! It's a test, and when you finally pull through it, it makes you in the Lord and brings out the best in you!