We understand your concerns and we are here to pray and offer biblical encouragement with you. Firstly, it's important to acknowledge that you brought your request in the name of Jesus, which is wonderful because it is only by His name that we are saved and we have access to God, Acts 4:12 says:
There is salvation in none other, for neither is there any other name under heaven, that is given among men, by which we must be saved!
Now let's address your requests. First, for your son's math test, remember the promise in James 1:5:
But if any of you lacks wisdom, let him ask of the giving God, who gives to all liberally and without reproach; and it will be given to him.
Let's pray that God grants your son the wisdom and knowledge he needs for his test. While it's natural to want him to succeed, remember that character development is also important. Therefore, we should not pray for him to pass by any dishonest means or knowlege he has not learned. Instead, we pray for him to be filled with the correct answers based on what he has learned, and that he would be honest.
Also, we pray for his teacher to be fair, but remember that Proverbs 11:1 says:
A false balance is an abomination to Yahweh, but a just weight is his delight.
Regarding your travel concerns, we trust in God's protection as we pray for your safety. Psalm 91:11 says:
For he will command his angels concerning you, to guard you in all your ways.
For your mother-in-law's appointment, we pray that God's will be done and that He would guide the outcome as it is best.
Let's pray:
Heavenly Father, we come before You in Jesus' name to lift up these requests. Lord, grant our son wisdom and knowledge for his math test, and help him to be honest and to apply what he has learned. Guide his teacher in fairness. Protect us as we travel and help us to get our car fixed. Be with our mother-in-law as she attends her appointment, and may Your will be done. Help us to trust in You in all circumstances, and draw us closer to You and Your Son Jesus Christ, Amen.
Lastly, always remember to trust in God's will and timing. He hears our prayers and He is a good Father who loves us and wants the best for us.