The Leitner System was designed by German scientist, Sebastian Leitner, and involves studying with flash cards and five boxes. All your flash cards start in Box 1. When you revise a card, if you get it right, the card moves to the next box (Box 2). If you get it wrong, it goes in Box 1. The next day you study the cards in Box 2 (the ones you answered incorrectly the day before). If you get it right, it moves to the next box (Box 3) but if you get it wrong it goes back in Box 1. 
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You revise the boxes on the following days:

• Box 1 — Every day
• Box 2 — Every 2 days
• Box 3 — Every 4 days
• Box 4 — Every 9 days
• Box 5 — Every 14 days.

Some dog therapy for your Friday.

I can't stress enough the importance of getting outside, particularly getting out into nature if you can. Even if you're in lockdown, most states allow one hour of outdoor exercise a day. Get outside and go for a walk, run, skateboard, bike ride... If it's wet, take an umbrella. If it's cold, grab a beanie and scarf. Make yourself a smoothie, hot chocolate, cup of tea [insert your drink of choice here] and go and sit in your backyard, courtyard or  balcony. Take a magazine, book or sketch pad. 

According to Very Well Mind*, the right amount of stress can increase your memory performance. But too much stress inhibits learning because the stress hormones that are released impede the formation of memories. This is not helpful if you are trying to learn a new concept or recall an old concept for a test. Stress can also be exhausting which makes it difficult to learn. The good news is there are things you can do to reduce your stress. The Smiling Mind app has free guided meditations and mindful activities - some as short as three minutes that you can do before and during your study. 
* https://www.verywellmind.com/stress-and-your-memory-4158323