What acting technique can I learn in one month?

By Alan Chenkin, Learned about celebrities by reading the tabloids in the checkout aisle.
First off, you’re in SCHOOL. Actors are always learning. You are allowed to stumble, and learn, and get back up and keep going! Fight your fear, nervousness, and insecurity. How? Stand up at lunch and recite a paragraph from a book, or a passage from a popular song, or a political speech that inspired you.
Do it more than once.  Try to inspire.  Ask your friends to be critical, and suggest ways to improve your delivery, posture, or expressions.
Find a buddy to work with, do some acting drills:
If you are nervous about asking someone to help you – look at 5 Ways to Conquer Fear and Ask for Help[1] and Asking For Help Reveals Strength, Not Weakness[2]
Work it, Practice it, Bring it. You have a month – use it wisely!
There is something else to consider; after a month, you are not “done”.  Acting and performing are skills which go weak over time.  You must constantly practice, learn, ask for feedback, find new lines, and stretch your limits.  Acting will expand your horizons and abilities.  You will be more at ease when speaking in public, discussing job possibilities, interviewing, and even improving your interpersonal relationships.
Don’t stop after a month.  Don’t give up.