Dear Varun, 

Hope you are doing well. As per your query I think that if compared between RNS, JSS and SJB definitely SJB is the best. RNS has a rating of 3.2 and JSS has a rating of 3.0 whereas SJB holds a good rating and is overall a good college than the Others. For more information click on this link below.

https://www.careers360.com/colleges/sjb-institute-of-technology-bangalore

Hope this helps!