i belong to obc, in 2020 kcet application form i filled by mistake my father income as 65000 ( but actual value which is mentioned in cast and income certificate is lesser) in 3rd sep 2020 i have to upload all the documents. will they consider income and cast certificate income value or not

That's not a big issue at all. But if there are categories based on family income and if you have mistakenly put some value which does not satisfy the actual income at all, there may be problems. You have not mentioned the actual income, I assume the income is 60000 and you have put 65000, there is no problem at all. There are a few tution fee waiver scheme, for which they ask for family income. Hope this helps. Best of luck.