OK, don't panic--that is step 1. We have all been through this, so we fully understand the anxiety that you are feeling. Remember, don't make this any harder than it really is!
You will do just fine! Study hard every day and really know and understand the elements of examination that are listed on the NCEES web site for the exam that you are taking. Remember, the exam is designed to be completed in 6 min per question. Now, some questions will be able to be answered by inspection, the answer is obvious. Others, may require several calculations and take 7-9 min to complete. If you are totally flummoxed, go to the next question and come back to that question later.
Remember, you have a 25% chance to get the answer right by pure guessing-- The test is multiple choice, with usually 4 answers provided. If you know the material, you can usually eliminate at least 2 answers right off. Now, you only have 2 to work on, with one being the correct answer. Make sure that you know your signs during the calculations--- if you get a sign reversed, there might be that answer as a choice!
Don't put any more pressure on yourself than there is already. You will do just fine. Don't worry about your job-- you can worry yourself sick and get ulcers-- you will do fine.
Make DAMN sure that you understand the concept that is being tested-- that is the key. There is no reason to take the test more than once-- it is expensive and takes a lot of time. Hit it hard now until April, take it, pass it and press on.
Good Luck-- you will do just fine.