Hello,

For the IAS exam, you can enroll in any bachelor's course. It would be great if you figured this out and solely pursued your bachelor's in this discipline as you are already clear that you want to choose Botany/Zoology as optional studies. The optional subjects are crucial to the IAS exam. Even if you are uncertain about this, you should choose B.SC (Zoology, Botany, Chemistry). Because you would be able to study both botany and zoology in this, and you could also choose an optional subject at the end.

For more information, check the given link : https://competition.careers360.com/articles/upsc-ias

Thank You