Sir my marks are 420(UR).Can I expect seat in any government college under national pool.?

So sorry for you my friend but looking at the competition going you can not secure a seat in the government colleges. I know it sounds harsh and rude but giving you any false promise would neither help you nor me. Those who got 505–510 even they are struggling in the all India quota's counselling to get a seat for themselves so, for you at this score you already know your fate by now. But you don't loose hope by this marks you can opt for BA MS or you can think about the private colleges but the minimum tuition fees is somewhere around 50–60 lakhs. If you that much financially sound then you can go for private university.