Hey Roshni,
You seem to have an interesting profile with some solid work experience.
You have international work experience, that is very much valued by schools so that is a huge plus.
NGO experience is also a plus point, as schools love people who can think about more than just themselves.
Also the extra exams and certifications you have taken, show you are passionate about finance.
I am sure there are a lot of other things, which you have failed to mention and which will ad value and depth to your profile.
HEC is very particular about the GMAT score and i would suggest aiming a score above 700.
Apart from that you really need to submit well rounded essays and LOR's, as GMAT is just the tip of the iceberg.
You can check out our site
https://mim-essay.com/profile-evaluation?gcf and get a more comprehensive profile evaluation done, also there are a lot of tips on how to submit a better application. So that may help.
Regards,