It's just a simple essay about Malaysia issue, there's no right or wrong so chill, you will be given few hours to complete the essay. Are you being offered IT position for application developer?

Ahh I see you applied as Application developer, it must be from my rejection    . Well the interview process is quite straightforward question, nothing much technical but please answer confidently, know the current financial institution digital innovation, industry 4.0. U shud be hired by this keyword 

for essay there would be a general knowledge question, brain teaser and open topic.

then there would be a group discussion session. where the question is all about IT problem and solution.

after that, there would be an interview session with 3-4 panel. HR and Managers / Deputy Directors.

this is based on my experiences back in 2017, now more or less is the same process.. (i think so )

i applied for IT support executive, initially there was 10 ppl and as it progress to later stage only down to  5 ppl.

hope this help.

Well the package is not attractive hence I rejected it even after nego.

150-250 words and it's open issue. Serious you don't need to be afraid about the essay, it's just like a mere requirement, plus you may google the topics for some word/sentence etc. Focus more on preparing the interview.

Normally it will be a mixture of questions. Behavioral, technical, working style, etc. it all depends on the interviewer. Google and Youtube can be a good guide to prepare for interview.

As per stated in my previous reply, please read more about FinTech, Digital Innovation for Financial Instituion, Industry 4.0 and during the IV mention those keyword at contribution question. This will help you a lot to gain advantage compared to other candidate as not all software developer know about this.

I work in financial institution as a programmer so that's why I think applying BNM is quite easy and the IV is quite easy. Don't worry they won't kill you about technical question as you are not going to be a vendor. When you are working with big firm like GLCs you need to know more about the SOP, Processes, and fundamental of technical things.
So my advice just read up the topic on what I said and make research on banking IT development like Maybank App, QRPay, etc and how it impact society.