Answer 1

There are no Kotlin and SQL challenges available yet. We hope they will come soon.
Contact [email protected] for more.

Answer 2

esQmo_
Challenges dont proof knowledge.
It is more a kind of esports.
Try the code coaches if not yet done.
They are a good test.

Answer 3

Oh thanks, will try that too

Answer 4

Please use search before posting questions. As this is a duplicate, I am marking it for automatic deletion in 24 hours.
https://www.sololearn.com/Discuss/1682668
https://www.sololearn.com/Discuss/1912747
https://www.sololearn.com/Discuss/1949782

Answer 5

Good, I would like to test my knowledge on that too