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Get more documents that show your family's wealth. This is more important for the embassy. What your family owns, how much cash in the bank etc.

I already did that and that's why I think it's not rejected with a financial reason, they didn't check any reason related with financial status or wealth
 
I already did that and that's why I think it's not rejected with a financial reason, they didn't check any reason related with financial status or wealth
I don't know what exactly you put on your application but if they don't see clearly that your family has ~20-30k per year easily reserved for your education, they may refuse. If this requirement was satisfied then I don't know why they refused you.
 
You applied visa on conditional offer letter? You have to fulfill the condition then apply visa. And sop should show your intent clearly.