The only high-probability path to investment banking is through an MBA. CFA alone can almost never lead you to investment banking. And at an MBA too, only the top-notch IIMs (as far as India is concerned) - read A/B/C and L at the maximum. First of all, be assured that there are hardly any real front-end investment banking operations in India and most of the work is back-end. I've heard that SBI offers proper IB (front-end) profiles in the IIMs, but they pay only 6-7 lpa.
Even at A/B/C, there is absolutely no guarantee that you're going to get a so-called "i-banking" profile. The competition is really tough and unless you are {from the IITs with a good JEE rank and with preferably some experience in analytics} OR {you're a hot female} you cannot crack the summers, and the final placements are mostly dependent on the summers, but here the latter factor doesn't count

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Progress in CFA gives an IITian (or other good Engg. college alumni) an edge over others, nothing more. Even then he can screw up in the interview.
In the light of all this, I am assuming that you know what "investment banking" means. :drinking:
For your specific questions:
1. No, FRM has almost nothing to do with i/b. It's more about risk and its various types. Guys in credit profiles can also go for it. But it's damn tough, much more than L1 or even L2. The happy part - you can take it in two parts now, and the pass rates are >50%. So a bad paper can lead to a pass but that will never happen in CFA. In CFA, in fact the reverse can happen (i.e. even a good paper can lead you to a fail)
2. MS in QF from abroad (best), or campus placements at IITs (only for CSE/EE people). However as a general rule, a profile abroad will almost always be better than a Mumbai/Bangalore posting from the IITs.
I think that ISB has also started something at CAF, but no idea about its placements.
3. I have no idea about placements at ISI. But if I-banks go there for placements, a good bachelors' background (again IITs/other good Engg. colleges) would be of help. But in all likelihood, I-banks would be picking up for their quant profiles from there.
4. "Top 100 MBA" colleges in India is nothing. If you graduate from Baba Ram Chand College of Management from Kanpur, an L3 is going to get you nowhere. In fact I wonder if recruiters might ask you what you're doing there with an L3. :drinking:
5. CFA is not supposed to make you a specialist in a particular area, even though it is somewhat geared around Equity and Asset Management. It only gives you an edge at campus placements. Therefore, its market value is there only in a particular setting and there is no
general market value for it.
Ask yourself why people opted to go for CFA. The reason was because it gave you an edge few years ago, when most people did not know about it. Currently, L1 candidates are surely running into tens of thousands and several thousand of those are clearing L1. L2 cleared would also be into a few thousands. Even if a company were to consider someone on that basis, they would look for IITians. But the problem is that now even within IITians, there are thousands of IITians with L1 and several hundreds with L2. A hearsay said that for one position at Nomura, those guys get more than 8000 resumes.
The only scenario where you can land up in a GOOD position (by good I mean decently paying- nothing to do with the actual work) without an MBA would be when you're a CSE/EE graduate from the IITs with <1 years of experience (at the max. 2) and with good academics, but you somehow landed up somewhere else, maybe in IT.
Hey thank you for the insight, then what is in your view the path to investment banking?
Is FRM better than CFA for investment banking?
What is the path to get in Quantitative Finance?
Is the only path a M Stat from ISI?
Or the path to go in Quant Fin starts out of India?
If CFA all levels are the most fundamntal, for a non finance background is it not something to start with?
What does your experience says about the market value of CFA?
What do you believe is the salary range for CFA level 3 cleared person + MBA from any top 100 College of India?
please answer these questions, thanking you in advance