Hello sir, I do a mistake during ssc portal registration period that's I have fill the detail of diploma complete roll number and percentage in place of matriculation... if further during exam

Hello,

SSC doesn't have facility of correction for error, once the form gets submitted then no editing of detail is allowed, though you may try reaching out to your respective regional centre in this matter, you will find the details from the official website itself.

Hello Dear,

Staff selection commission is a lenient commission. So If you have made a mistake in the basic details (matriculation) of the SSC registration. There is a notice regarding the same on the official website for SSC CHSL 2018.
According to the Annexure-1 of the official website of SSC, you can make changes in the basic details, i.e., matriculation examination details only twice after the completion of the registration process.
The Annexure-2 says that when you apply for 'Combined higher secondary level (CHSL). The information from columns S.no. 1-14 will be filled automatically from the One time registration, but in case you want to make correction in any of this data, click on 'Modify Registration' and then edit your one-time registration.
This can be done only till the time you haven't paid the fees, and finally completed your declaration with 'I agree' and submitted the application.
But once the final application is submitted you cannot make further changes and SSC can also cancel the candidature of any aspirant if the information provided is found to be incorrect.

Good luck