First post so go easy on me

I've been trying to clock the Jap version of Chariot (Wonder 3) 1 credit.
I've learned lot of other shooters 1 credit mostly through memorization but this one just seems too bloody tough.
Has anyone finished it on 1 credit?? Is it humanly possible?! If I hear that someone has done it I will keep going and not give up as I currently feel like doing!
Any feedback appreciated..
Many thanks.
(mod edit - changed thread title in accordance with strategy section guidelines)