There are all sorts of phrases that are in common usage, of which, those using such phrases, may or may not know, that the invocation of God into anything that a given person says, typically has very strong religious connotations to it; so that if one requests God's will to be done, then one's desire for that to occur should be absolutely sincere, or else that person is clearly a hypocrite or has taken God's name in vain. Additionally, it is true that some people are confused about what God's will is or what it should be in a given situation, so the calling forth of the aid or the wisdom of God, certainly makes sense, if genuinely requested and adhered to. Remember well, that we should always take into consideration that we are not automatons, but have been gifted by our Creator with free will, and if we are wise enough to desire that our will be in accordance with God's will, so much the better.
That said, this typically invariably leads to the question as to what God's will is for each one of us, of which, the only correct answer to that vital question, is to recognize that God's will for each and every one of us is always going to be correct, on point, and unchanging --no matter our given circumstances in this life; for God always and forever wills the "good" for each one of us. That is to say, God's will, is that we do good in all that we encounter and contemplate upon, so that we thereby are just and upright in our actions with others. So then, when someone requests God's will to pass a particular school test, or to get a desirable job; such a petition as that, is correctly answered by God willing that the result thereof be fair and in accordance with that which we have brought to the table for those endeavors. In other words, for instance, to will from God, that we be accorded something undeserved because we haven't, for example, put forth the appropriate amount of effort or time to accomplish such, is not going to change the result; for our God is always and forever will be a fair and equitable being, so that, in essence, God does not play favorites, and never takes from one to undeservingly give to another.
The petitioning for God's justice, through the sincere request of His wisdom or will, is something that most definitely has its appropriate place, and those that truly do desire to live within what they consider to be God's will, need to thereby live to the tenets of what God fully represents -- which is unconditional love, the willing of the good of the other, and the treating of each individual that we so encounter, as having equal worth with us; in the conscious recognition that we all are fellow brothers and sisters of the very same God. After all, those that desire that God's will be done, but have not taken the time to actually comprehend what God so represents, or are confused about such, may not know that a truly sincere petition to God for His will to be done, necessitates always our humble acquiescence to it.