First Registered for Postal Coaching
If a student has registered for postal coaching first, he/she would have paid the total fee for all the Modules initially since there is no installment facility.In such a case, a student intending to take up oral coaching for one of the modules requires him/her to bear the extra expenditure for enrolling for oral coaching.
First Registered for Oral Coaching
If the oral coaching center provides for registering for each module separately, then the student might have paid the fee for only one module.
Even in such a case, the postal registration for the module for which no coaching has been taken up requires the student to pay up the full fee for both the Modules since no specific mention is made regarding the fee for one module.
Please verify with the respective regional council if they would allow registration for one module by paying a lesser fee.