ITC accumulated products

I manufacture 2 Products with raw materials of 18% gst
One of 5407 hsn of 5% gst with no refund of ITC accumulation
Second of 5806 hsn of 12% gst with ITC refund
Then how will I get refund of ITC, if I produce 70% product of 5 gst and 30% of 12 gst