1. Is it even worth to leave the stat board to go into a bank tech job? Does it pay better?

You're getting 83k a year ( with bonuses, I'm assuming base pay is decent? 5-6k? ) with less than 2YOE and you're unhappy? how much base pay are you looking for?

2. What job skills are the hottest in banks now and I should self-study?

ReactJS, Blockchain, Machine Learning.

But do you have interest in these? You're a software engineer, probably go with ReactJS. At least it's general knowledge, good to have and useful for non-banking roles. ( Tech MNC front-end jobs )

3. All other advice/views appreciated!!!

My take is that you're reaching 2 YOE, finish it first then think about job hopping.

2 - 3 YOE is the typical time to job hop. Not < 2 YOE. Also why banks? I'm sure you'll do better in tech MNC and learn more. Banks are pretty crap, if you think govtech is bad, wait till you work in bank... tech is awful.