Might I recommend a book?
https://www.amazon.com/Infinite-Powers-Calculus-Reveals-Universe/dp/1328879984
Calculus is amazing. It’s literally why we have anything in our modern world. The basic idea is when you encounter any type of problem, math or not, you break it down into little pieces and once you solve for each piece you get the full picture. That’s all calculus does but to the extreme. You analyzing every infinitely small piece and putting it all together to get an idea of the big picture.
To quote the famous physicist Richard Feynman calculus is “the language God talks”.
Another thing I'd recommend is this book: https://www.amazon.co.jp/-/en/Steven-Strogatz/dp/1328879984
I've not read it yet (it's arriving soon), but I've read other books from the author, all of which were great.
If your exam is coming up soon I guess you might not have the time to read it, though, it'd be best to focus on things that are more to the point like khanacademy.
If you have any specific questions you need help with I can try to help.
I view drawing as a valuable form of therapy. I've had musculoskeletal surgeries and pain/function is a daily struggle.
As this is a therapeutic activity, I don't have a deadline for completing any drawing. Take your time. It's OK if you spend the rest of your life working on one drawing.
I like using the block technique by dividing the picture I'm drawing from into small squares and have corresponding grid on the drawing paper. So you are drawing many small drawings to make a big one. Yet it is all freehand and no tracing. If you think about it, this is how calculus works and calculus is not cheating but to mathematicians it almost seems that way as it transforms almost impossible problems into simple solutions using the mystical concept of infinity. (not a calculus expert but studied in college and recently read Infinite Powers: How Calculus Reveals the Secrets of the Universe.
To deal with the daily pain issues, I only take herbal supplements, meditate, and eat an anti-inflammatory diet. One herb I take, especially while drawing is a low dose (2 to 3 grams) of kratom as it reduces pain, allows me to focus (it is in the coffee family) and the best part is it makes music so much more meaningful.
Music while drawing is so important for me. I have a large screen TV to look and listen to while drawing and use a YouTube playlist of meaningful song from my era (1960s - 1970s). If I don't get moved enough by the music to bring a few tears, I think that day’s drawing will not be so good. Careful not to get any tears on your drawing.
I frequently use a vaporizer for generating some lavender mist while drawing. Therefore the inputs involves sight, sound, smell, and touch.
I have had no art lessons but watch an occasional YouTube.
Attached (hopefully as this is new for me) is a charcoal of our daughter while she was going through chemo/radiation at Memorial Sloan Kettering in NYC. Imgur
I took the picture 2 years before she 'crossed over' but was so grieved that I couldn't draw her or anything else for 6 years afterwards. Discovering the usefulness of kratom allowed me to start drawing again. Not advocating anyone try kratom for drawing motivation but it helped me with that and other issues. Remember, everything in moderation, including moderation.
I hope my journey is helpful to someone.
I think that this recent book by Steven Strogatz is exactly what you are looking for. It's excellent:
https://www.amazon.com/Infinite-Powers-Calculus-Reveals-Universe/dp/1328879984
Raj
Have you read this book by chance?