I live in southern India, and I've noticed that in Indian English, the word "even" can be used without indicating surprise, as it does elsewhere.
Even you should be able to understand this.
You're not implying that someone is stupid. It simply means "You should be able to understand this too." It may even be a compliment, if you're referring to something complicated.
Even I have a Bachelor's degree.
This is not self-deprecating. Nor does it imply that having a Bachelor's degree is very common. You're simply saying "I have a Bachelor's degree as well."
Even I failed the history test.
You're not saying you're a very good history student, so it's surprising that you failed. Nor are you implying that the test was hard or unfairly graded. You're simply stating "I failed the test too."
Real example from my own life:
-Harry Potter is really popular. My sister has read all the books.
-Yes. Even I have read all the books.
My friend reads a lot of books, and it wasn't surprising that he'd read all the books. He used "even" just like one would use "also" in standard English, though with different syntax
-Lots of people play PlayStation.
-Even I play it a lot.
The second line doesn't (apart from the fact that it seems to be in agreement with the line it's replying to) say anything about the popularity of PlayStation. Again, it's using the word similarly to how standard English would use "as well", "too" or "also."
Please note that I may not understand the usage perfectly, so clarification from people who are very familiar with Indian English would be very welcome.
How widespread is this? Is it common in all of India? What about other countries?
Where did this originate?
Was it a feature of British English which has since fallen into disuse (perhaps due to insulting/boasting connotations) but remained in Indian English?
Or does it have another origin?
This is obviously something which can lead to unfortunate misunderstandings if both parties don't understand the differing connotations. (It did for me during my early months in India.)