This is the 4851st most frequent Turkish word.
ekstra
"Extra" or "additional."
In this sentence, 'ekstra' is used as an adjective meaning 'extra', referring to an additional amount in the expenses.
Bu ayki harcamalarımızda ekstra bir tutar vardı.
There was an extra amount in our expenses this month.
Here, 'ekstra' acts as an adjective specifying 'extra', connoting something additional (sugar in this case) to what is normal or expected.
Kahveye ekstra şeker eklememe gerek yok.
I don't need to add extra sugar to the coffee.
'Ekstra' here describes the 'studies', again as an adjective, meaning 'additional' or 'beyond the usual'. It emphasizes the need for more effort.