As per the information available online, TCS allows all branches to participate in the placements. But the point is that one should have a sufficient knowledge in coding in order to get placed. So if you are from a non-CSE/IT background and still you want to go for that genre of jobs then you need to work on coding skills and you have to learn the coding languages such as JAVA, SQL, C, C++ etc. So if you are wiling to go for CSE related jobs you have to put some efforts apart from your curriculum.

For Placement interview tips you may visit the link below:

https://engineering.careers360.com/articles/10-tips-for-placement-interviews

I hope this answer helps. All the very best for your future endeavors!