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Please state the name of studies is it B.Com( A&F) ? If you have completed it with Grade C then you can join CA through Foundation mode because for direct entry mode you have to fulfill the criteria as : .
Commerce Graduates/Post-Graduates (55%) or Other Graduates/Post-Graduates (60%),
with this criteria you are eligible to Enrol with the Institute for Intermediate Course.
For More details please read this document:
https://resource.cdn.icai.org/19323ca_atcourse260510.pdf