Hello,
If you are a general category student, then you need to have an aggregate of at least 50 percentage in your class 12th examination and must have taken Physics, Chemistry and Mathematics if you are an engineering aspirant. Since you have mentioned that your percentage in class 12th boards is 59 percentage, then you have sufficient marks for qualifying for admission in RVCE or MSRIT. Now, to take admission in RVCE or MSRIT, you need to have a decent rank in COMEDK-UGET. As far as placements are concerned, it clearly depends upon your profile. If you are willing to work hard enough, get decent marks in the college, build skills etc which help in building a good profile, then 12th marks would not matter much but there are some companies whose pre-requisites include some specific percentage of marks, in that case your marks of class 12th may create an issue.
I hope this helps. For any further queries, ask mw in the comments.

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