Measure carefully, Calculate correctly, Understand what the questions are asking, Find the correct answer in the Spec. Thats pretty much it. Take all the time you need, breathe deep, relax. OK thats it.
One of the hardest things for some folks to do is to put aside their "gut feelings". Forget the codes or specifications you are familiar with. You must go with the specification provided. Read the question carefully.
Double check any answers that have the same numbers with a different decimal point, sometimes your choices will be .123, 1.23 or 12.3. If one of the answers is expressed in metrics, do the conversion as the "most correct" answer is what you are after.
You may not need to use every tool in the kit. When measuring, especially some of the rounded indications, use the scale AND the magnifying glass together.
Some of the poorest questions are the ones with photographs of NDT methods. Know your NDT basics and study the photographs carefully.
~thirdeye~