What I could make out of your question was you were asking in case of a tie(same marks) how rank will be determined. 

A lower rank is given to :

(a) Candidates obtaining higher marks in Biology (Botany & Zoology) in the Test.

(b) Candidates obtaining higher marks in Chemistry in the Test.

(c) Candidates with less number of attempted wrong answers in all the subjects in the Test. (d) Candidates older in age to be preferred.