I'm sorry if I appear to be going against the popular opinion, but I don't particularly believe that the verses about acknowledging God in all your ways and praying without ceasing necessarily mean that you must pray before you do anything and everything or be punished/not do as well.
When it comes to homework, sure, if you feel convicted to pray first, go ahead (LOL, and on some it can't hurt ~.^ )
However, if you didn't pray but you did resist a temptation to cheat and you did work responsibly, you've acknowledged God in your ways a lot more than even the most detailed and intense prayer would have, see what I mean?
IMHO "Pray without ceasing" means to persist in your requests, to have faith that they will be answered-not to go around all day mouthing prayers all the time. I can tell you from personal experience, such praying may start out spiritual, but it easily becomes an empty mechanical exercise.
As for the idea that prayer/giving/Bible reading/whatever are some kind of currency with God, where we "buy" His love, protection, blessing, etc. I totally disagree with it.
First, we should pray, give, read, whatever because we love God and want to talk to Him, want to give, want to read-not because we fear that He is going to turn against us and, say, make you fail the test not prayed over or cause you to have a paycheck docked because you didn't give in every offering you could.
Second, God doesn't work on a currency, pay-and-recieve basis. I can give some examples of how this works both ways:
In 1998, soon after I became a Christian, my family wanted to rent a house since we were being asked to move from our old house (the landlord wanted to sell the place rather than rent to us) Anyway, I prayed and proceeded to read 20 chapters of Proverbs in one sitting (in the KJV to boot) as a "sacrifice" so that we would get the house. We got the house-unfortunately it was a slum and we had to move out 8 months later when it was condemned by the fire department. Now, if blessing were conditional and earned, such an event might make me seriously question my faith.
As another example, I once saw the most beautiful sunset over the mountains near Lake Arrowhead here in California. I didn't pray for a beautiful sunset, I don't remember if I had read my Bible yet at the time, yet there it was-a sight I'll remember until the day I die for its beauty. Yet it was
freely given to me and to all others who looked at it.
Anyway, with all that I digress. My point though is that there is nothing that says you should or should not pray before you do something, and that it's about your motives for praying. If you think your prayers will make God bless your test scores, forget it-you'll only end up blaming Him when things go bad. If you pray because you want to talk to Him about your homework, go ahead-and I applaud you for your conviction.
Anyway

I'm happy that you're thinking about practicing the faith again, just keep in mind that it's not about what
you do for God but what
God has done for you.