Our sense of smell is closely tied to our memory. Just smelling certain aromas can trigger strong, vivid memories. The smell of your mom's perfume or the scent of rising bread may take you back in time. You can harness this link in your daily life to help you remember things more clearly.
When I was in college (as a mother of two, a preschooler and a newborn, sleep deprived and fuzzy headed) I used scented oils to help me study. A few drops each of rosemary and peppermint in a tiny spray bottle with some distilled water travelled everywhere with me. When I sat down to study, I spritzed a bit on my wrist or my notes. It helped me to focus and it initiated scent memories. When test time came, I spritzed myself again, using the scent to help me access information I had studied more easily.
The next time you need to focus and remember something, try to use a scent to help establish a link in your brain between the moment and the recall. Sage, rosemary and mints are all good choices for memory, but pick something distinctive and that you like. Recreating the circumstances of your study can help you access your memory with less stress, which can help with recall as well.