That depends.
I say that because destroyer is harder than the actual exam. its there to work you so that come the test day say for a multi step synthesis in ochem. You may not be asked to start from step 1 to step 5.
they may start you off at step 3 and you to complete it.
The other part is that destroyer has no distribution to it in terms of question order. you will run into sets where its too time consuming with lots of calculations and in later with sets of questions where its too basic.
If you have been studying for sometime now and the 50 questions were extremely basic questions like for Bio what is DNA or in chem questions like which is a metal or non metal. Or something where the choices were so obvious like asking what the color of the sky is there would be some concern.
If not then don't worry, its normal for the majority of people. Go over it twice. Know why the other choices are incorrect too if possible and you'll do fine on the test.