Will my OCI application be approved?

Hi everyone, It would be really helpful if you guys could give me some suggestion regarding my problem. I am Manvendra raj, My father is a nepalese citizen and my mother was from india, she took the nepalese citizenship after marrying my dad. I want to get a OCI card for myself as I want to migrate to india for studies and also want to get citizenship of india. Now the catch is my mother birth was never registered she only has her 10th and 12th school leaving certificate. And there is also one more problem, when she applied for the nepali citizenship the registrar accidentally wrote her name wrong and there was no process of correcting the mistake. The name in her marksheet is rubi kumari and her name in citizenship card is ruby karn. (PS: she changed her last name without getting any name change certificate because there was no process for name change at that time, she just wrote karn as her last name) Now is there any chance that my oci application will be approved ? And is there any sort of document i can produce from nepalese authorities to get of this problem? Regards, Manvendra Raj.