Hey, thank you for contacting us. Since you aspire to write KAS competitive exam what you are doing is going to be very helpful for your exam. The exam pattern is such that it touches on the Arts subject a lot, be it economics, history, political science, environment, culture etc along with science,  geography. The arts subject is going to help a lot in your exam so I suggest you can shift from science to arts stream. but the decision is up to you. I hope this helped.

best wishes.