This is something that I still need to work on is time management. - grammar?
What's the Subject of the second 'is' of this sentence?
If it's hidden, then what is it, and where is it supposed to be at?

Question

This is something that I still need to work on is time management. -> grammar?
What's the Subject of the second 'is' of this sentence?
If it's hidden, then what is it, and where is it supposed to be at?

Answer

The text is ungrammatical.

Here are two correct versions.
Time management is something that I still need to work on. 
Something that I still need to work on is time management.