Does citric acid oxidize to a keytone?

It is NOT oxidation , but REDUCTION.

The orders of oxidation are:-
Primary Alcohol; Alcohol, Aldehyde , Acid
Secondary Alcohol ; Alcohol, Ketone
Tertiary Alcohol ; Does NOT Oxidise.

Order of Reduction is the opposite to oxidation.
Acid . Aldehyde . Primary Alcohol
Ketone, Secondary Alcohol
Tertiary alcohols do not reduce further.

The alcohol functional group in citric acid is a tertiary alcohol. Tertary alcohols do NOT oxidise. Hence a ketone is not formed

NB note the spelling of 'KETONE' not 'Keytone'.

No. A tertiary alcohol cannot be oxidized to a ketone. This is why citric acid must be isomerized to continue the Krebs cycle.

No, the acid is the most oxidized form.