Thank you for your help, it's alot clearer now.

Go back into the question and use word.substring(0) and tell me what appears in the brackets.

wouldn't we assume,
[0] = T , [1] = E , [2] = S, [3] = T , [4] = I , [5] = N , [6] = G

Therefore if word.substring(0) should start from position [0] including itself so it would return testing
And if we wanted the middle character for odd,

word.substring(word.length()/2 ) <--- wouldn't that be the substring from index [4] being I, not T ? 7/2 =3.5 and I would assume it rounds up? Or is that incorrect thinking would it round down on decimals to index places? Is that what it usually does?

There is a problem with the question, If you do the question in Java and for the odd questions testing only return word.substring(0);

It should return the full test word back as a check, it only returns [esting] Which is incorrect with how the substring works and the indexing of the letters.

This needs to be fixed.