Engineering Entrance Exam

Go for coding. Its safe.

Yes, you can easily get admission in Mumbai colleges. Here is list of top architectural colleges in Mumbai
1 Sir JJ School of Architecture
2 Rachna Sansad
3 Kamla Raheja School of Architecture
4 ls Raheja School of Architecture
5 IES School of Architecture.

No, 50% is minimum criteria unless you are from backgrownd class or person with disablity it is 45%(applicable only for maharashtra students).

If you have confident you can fo better. Then you can wait. But if you haven't enough confidence or you have confident but now you can't give the same effort or time on study. Then you should apply for WBJEE counseling. But some of my experiences said that it's very hard for a person after 10+2 exam to give same effort on study as he/she gave previous. And due to corona everyone faced problem. So now this is depends on you. If you heart say 'Yes I can do' then wait otherwise WBJEE Isn't a bad option.

As per previous years statistics you will get admission in ME brunch. But if you belong from OBC, SC/ST then you will get chance to admit in other brunches also.

If your general rank is 1599. Then you must have gotten admission. But if your OBC rank is 1599 then it is very difficult to admit in kalyani.