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You may check manit site for the statical data. Complete placement statistics with percentage placement is provided there. About the scope, I would suggest metalurgy had a good scope but with a lot of work on itself. Conceding your marks if you have category or belong to home state still opt for a better branch in the collage. But if you have interest, metalurgy isn't a bad. Check out NIRF data too placed on site of college or NIRF site.

Yes, you can as you have scored well.

Yes it is good and u can try for that

You can best try for your home state NIT. And then some other NITs of low rank. But the chances are maximum for your home state NIT.
So, good luck with that.

It depends on your JEE rank. If you'll let me know your rank then I can assist you further.

Hello,
It depends on your JEE score, in RCOEM we have CET as well as management rounds with separate cutoffs for SC / ST, OBC and OPEN.

Please see that this JEE score is not enough to get you into any reputed college. So, either you will have to for a private college or you can drop for 12th improvement and JEE preparation.
Good luck.

I think you are not mentioning your correct rank. If your general rank is 50k then your ST rank can't be 16k. It will be under 1500.