Hello, the eligibility criterial for most of the colleges is that the candidate should have passed their 12th or equivalent with minimum 50 percentage. There is no prescribed stream requirement. The colleges usually offers direct admissions too. You can refer this link to know the BA course offering colleges https://university.careers360.com/colleges/list-of-ba-degree-colleges-in-karnataka

Also you can obtain a double degree simultaneously through distance education too. You can refer this link for admission process https://www.careers360.com/university/karnataka-state-open-university-mysore

Best wishes.