Hello student!

To have a whole clear degree in your hand you first need to clear the ATKT of your SYBA Sem 4.

As far as aspect regarding Semester 5 and 6 is concerned, Yes you can attempt again through IDOL.

But the aspect regarding Theory, I am sorry but no as Math and Statistics are both practical based examinations, you cannot just opt for theory.

It does not depend on anyone but just on the person who will set the exam, whether to ask theoretical or practical questions.