I would explain to the instructor or whoever is going to be holding the class your situation. You may want to check out some videos. So many free videos on YouTube. Also Jenny Doan has a lot of instruction videos. If you go to her website the last few video pages like 20 to the end (you have to scroll all the way down to the end of the page) is mostly about beginning sewers (I prefer seamstress). Any way try that also. My niece took a beginning class at a local quilt shop and she already knew (at the ripe old age of 10) more than everyone else. She had already made the item the class was going to make. it was mainly first cleaning and understanding the machine, 1/4" seam allowance and measuring the fabric. She had photos on her phone of everything she had made. So ask what the class is about. You may want to look into a more advanced class. You can always learn something though. My niece said she did learn something from it and was glad even though a little bored that she took the class. It was an hour long.