Success factors

I categorize the success factors in two categories - intrinsic (आंतरिक ya आत्मिक) and extrinsic (बाह्य) . Intrinsic ones are more important than extrinsic ones, but they are very important and other things being same, can make a huge difference in outcomes. By these however I dont mean IITable or not IITable... I am more talking about success and happiness in life... many of these factors can compensate for the other based on भाग्य, but if they are all working together, the outcome is deadly. More often than not kahin na kahin sabka platform khali hota hai...

So without downplaying external ones... I would start with Intrinsic. 

*Intrinsic:*

Here are the intrinsic factors, some may sound similar to others and hence I am providing the difference in details under each of them below (#1 most being important prerequisite)

1. लगन

Can be defined as a combination of committment, sincerity, acceptance of challenges, perseverance no matter what, focus, lack of distractions, these traits to be present regardless of area of interest)

2. कौतूहल 

In continuation to above, this is another very very basic trait, That basic! yes. Bachcha questions poochhta hai ki nahin!! Yeh ek aisee trait hai jisko bahut sare parents badhava nahin dente, balki isko suppress kar dete hain... yeh ek aisee cheez hai jo bande ko is paar se us paar... yahi ek bahut badi cheez hai jo #3 ko create karti hai aur #4 aur #5 ki sahayata karti hai, badhava deti hai bahut teji se...

3. रुचि

Area of interest at a more foundational level. This is most visible when the person is a child 1 yr to 11 yr of age. And that to in the smallest things. Pote ke paanv paalne mein hee dikh jaate hain... Ya bachcha indoor pasand karta hai ki outdoor. Bachche ko kuch create karna pasand hai ki nahin. Bachche ko music arts sciecnes math pasand hai ki nahi... vagaira vagaira... प्रेम aur जूनून yahin se paida hote hain.

4. बुद्धि

Logical and Emotional Intelligence, Wisdom, ability to discern good from bad, ability to conclude, clarity of thoughts, ability to take decisions, ability to compute several conditions, dependencies, cause and effect and decide path of choice, ability to determine risks and rewards correlation, ability to learn, ability to retain and recall quickly (memory and access), ability to breakdown complex scenarious and concepts in simpler ones quickly or assemble a lot of complex things into one or two simple concepts, ability to join the dots in seemingly uncorrelated concepts and most importantly ability to self-evaluate!! Emotional intelligence is a very very big factor in success. Bachchon ko social banna bahut zaroori hai.. aur doosron ki bhavnao ko samajhna... kyonki usi se pata padta hai ki aap doosron ke kaam aa sakte hain ki nahin aur kaise...also see #6 because that is what leads to interpersonal skills.

5. मेहनत

Like you said, there is (no substitute)x3 for hard work. I very much agree. This is one area that has the ability to backfill gaps in #1,2,3 and 4 above as well. But if combined with #1,2,3,4 it makes a very very deadly combination... a force to reckon with.. this combined with practice make a person perfect. As many times one practices, faster and better the outcome. Whether it is with revisions of lessons or repitition of actions. 

6. पारस्परिक कौशल 

Interpersonal skill is a right brain skill, it is very closely related to emotional intelligence. Ability to interact with others in their favor and your favor is a huge skill! What you can learn or achieve by this is 10x more than what we learn from books. A successful business man will call this skill as one of the highest skills. Because this gives the person ability to understand what others are looking for and how they can be of use etc.

*External:*

Here are the extrinsic factors. I think you have covered many yourself too..

1. संसर्ग (Exposure) or संगत (company)

Like you said environment is very important. That mom can help create. With the power of internet in the palm of ones hand, this is ginormous. But at the same time, people one associates with changes persons thought process. The person slowly becomes the average of top 5 person he or she spends most time with. there are many factors there... but mota moti thats the thing.. person's thought process and health both can depend on this

2. भाग्य (Luck)

This one is huge and can decide whether you are healthy and wealthy and have other things that are right for your exposure etc or not. You may have all the facitlities of exposure like coaching etc... but if not lucky you might be getting exposed to time wasting things there... or you might be most intelligent person on the planet but you might end up broke and bankrupt like Tesla if you dont have interpersonal skills.

Work hard, rest of the factors it may be too late to ask to work on... unless you or your ward is between 2 to 11 years old. As grandparents we can teach some of the above things to our grand children and teach our children to 'foster' those behaviors in their children... because trust me, no one else teaches early enough for kids to learn how to 'learn' or learn how to 'parent'!! So teach your kids how to parent now,  otherwise it will be too late as the window of opportunity to develop intrinsic factor is between 2 to 11 the most!! And after that the ability to influence intrinsic factos reduces like crazy... 

So Hard work and area of interest is the most important at this time... coaching with someone who has recently been there and done that will make a difference...