Kolkata

You can definitely get a decent job in Kolkata if you have the required skills. Electronics and instrumentation engineering do provide a lot of scope in both IT and non-IT sector. But remember one thing, don't be assured that a company will allow you to work only at one city. You may have to go at other places as well.

Hi Ritashree,
Yes, you definitely can.
The maximum gap should be of 3 years. So do not worry, and wait for the next year. Till then, you may do some Diploma courses of that genre. Revert back for any doubt.

It is better that you go for online courses these days, as they are the most updated ones.

It is always good to follow the instruction given by the institute. So, if they have asked for attested documents, please make sure you carry the same during the time of entrance.

Yes, you may get in the 2nd counselling.

The college has the best faculty and experience too. You can take admission there. The Placement cell is active. Many companies visit this colleges in term of placements.

You have to first select the colleges in Kolkata, which consider CLAT score apart from NLS Kolkata. For more information please see https://www.shiksha.com/law/ranking/top-law-colleges-in-kolkata/56-2-0-130-0 or
https://www.shiksha.com/law/resources/clat-college-predictor.

Evening/distance/online/part time engineering courses are not valid any more as per the latest supreme court verdict, hence would recommend you to join regular B.Tech course for better career prospects:
http://www.tribuneindia.com/news/nation/no-technical-education-through-correspondence-says-supreme-court/491819.html