This is a very broad question and depends on what kind of experiment you are exactly referring to, however, in general, often scientific experimentation is best undertaken as a group because when you have more people, others can review any errors in the method or any possible errors in calculation and minimise the chance for these errors occurring, and also, you could repeat the experiment in less time-because you can allocate different roles to different people, and the possible discussion between individuals may overall lead to the development of a better experimental method that better meets the aims of the experiment-because more people-can consider more aspects-in less time. Hope this helps a bit-best wishes for you to ace your prac tomorrow