Where can I revise what I have learned

Answer 1

You can repeat the unit again. Make notes...

If you want to practise with code, go to the code playground and write what you can into a program.
Other threads with similar questions:

https://sololearn.com/compiler-playground/W0uW3Wks8UBk/?ref=app
https://www.sololearn.com/discuss/1369831/?ref=app
https://www.sololearn.com/discuss/281063/?ref=app
https://www.sololearn.com/discuss/435645/?ref=app
https://www.sololearn.com/discuss/764661/?ref=app
https://www.sololearn.com/discuss/2740039/?ref=app

Answer 2

Ask god

Answer 3

U are not okay