Probably not an improvement, but it is ONE query.
select sum(case when raw1 = 'a' then qty1 else 0 end +
case when raw2 = 'a' then qty2 else 0 end +
case when raw3 = 'a' then qty3 else 0 end +
case when raw4 = 'a' then qty4 else 0 end) as sumqty
from jtjobfil
I think table should be redesigned to be "vertical"