tax percentage exceeds

sir iam doing my metallic yarn business in tamil nadu now. here in tamil nadu it is comes under 5% slab but now in GST it is coming under 18% slab. while I put 18% tax from 1'st July. how much amount will be input to me sir. more over iam getting CST 2% goods & exempted goods also. now in GST all comes under 18% slab. what can I do now ?