Generic execution query

Possibly others are also facing this issue. This is very generic query so didn’t post anywhere else… If I am trying to get a fill of upper circuit to upper circuit micro cap stock buy order, what’s the best way to attempt it please… price is obviously not a differentiator… Does pre-open order work better for this please? Or higher the quantity better th chances of my order getting filled? How does the exchange order execution work and what is the ‘HIGHER’ probability execution strategy to fill my micro cap stocks order, which are moving upper circuit to upper circuit… Thanks a ton in advance…