There are two ways of clearing the said examination. The first way would to appear in your Chemistry Theory Paper coupled with its practical and clear this subject in the compartmental mode otherwise you might all the papers along with your failed ones with a view to clear the examination at one go.
However, there is a catch in it. Keep this thing in mind your latest scorings in all the papers would be treated valid. In case, you have scored more marks in a subject in the previous examination, you would be deprived of such benefits.
Here in your case, Improvement Mode is not applicable to you since you have in one of papers( Chemistry).Had you passed all the papers and were not satisfied with the scorings, you could have appeared in all the papers for the improvement of marks and in that case, your latest scorings would have been taken account.