I had Blumberg my sophomore year for chem regents and lemme tell u, this was one of my most memorable classes in high school. Though he gives much work, it is manageable with the time he gives you and your classmates to work on them together in class. He enjoys joking around much and he even does an experiment where you make ice cream at the end of the year. His tests are basically regents chemistry questions if you have him for that class. Just beware if you have him, he's going to make you remember 20 elements from the periodic table on the first week of school and MAKE YOU REMEMBER THEM. All in all, the guy just wants what's best for you. If you do your work and understand how to do it, you're going to be completely fine on the regents.