Hi dear,

As you are specifically talking about job placement so there are two cases you mentioned. As I am also electrical engineer , I will tell you about this in detail. If you complete your B.Tech and getting admission into NIT that is big achievement for you in your life. There are some advantages of this first is you will get M.Tech degree from prestigious institute i,e NIT. There are good chances to get placement in core electrical company  as per your specialization. Also there are many more software compnies too.So there is surity fopr placement in NIT. Second you can do lecturership in any Engineering college as you are M.Tech post graduate. Being pass out from NIT many colleges give offer to you so automatically your value will increase.

If after completion of B.tech you can go for courses then there are so many coaching institute but they are not sure about placement, also they take very high fees from you,  if they give placement then sallary is very less. They just try to make their business. There are many fake institute so don't believe on them.  Also off campus for electrical is vey less mostly negligible so you have very less chance to get palcement in electrical domain.

Hope you get it.