This is not a test just to pass you need to know all of it . Because out on the road other peoples lives depend on whether or not you know the laws of the road and how to control your vehicle. Besides the dmv usually switches the test questions by the push of a button just for this reason . You will still have the general questions mixed with different operational questions. So do yourself a favor and learn it all. This will save you headaches in the future from preventing accidents to helping you not get traffic tickets which are going up daily in fines.
Don't try to memorize the whole thing, it's not the matter of submitting everything to memory. Driving rules that we have now are based on statistics accumulated by analyzing traffic data for the last couple of decades and they are very logical. Like traffic signs, they are all color coded and you should notice that traffic signs that are more important are much brighter. Like those speed limits - black red and white - clearly visible made to attract attention, while information signs are usually green and can be disregarded. Try to build a little mind map for yourself while reading the rules. Then you can also test yourself with free Idaho drivers license practice tests, they should help you identify the rules you may have missed.
They will ask random questions. The tests are never the same. Check online with your State department of motor vehicle. They should have an example.