Hello Kadavakolla bhavya sri  ,

No, Comedk doesnt require qualification marks in each subject to get overall qualifying marks. After your exam, first COMEDK will release the answer key followed by the provisional marks of yours in comedk. Then your ranks will be published. and admissions will be given to the colleges base don your rank.

Based on your rank comedk will publish a list of colleges with opening nand closing ranks. if you fall under those ranks and you have filled those colleges in your counselling form. then you will get admitted. 

There is nothing as such called qualification marks for each subject.

Hope it helps!

Thank you!