How to Correct Date of Birth and Wrong Course
Correction of Date of Birth
Henceforth, information from the West African Examination Council (WAEC) will now be used to effect changes on the NYSC portal as from the 2017 Batch ‘A’ online Registration. The new procedure is as follows:

STEPS
Login to your dashboard Login to your dashboard (on http://portal.nysc.org.ng/nysc1) and click on the link to Date of Birth
Enter WAEC Verification PIN, select WAEC Type, Year of exam and enter your Examination Number
Click on Verify button
Click SUBMIT or CANCEL

Correction Of Course of Study
The Following are the Procedures for Correction Of Course Of Study On The NYSC Platform.

STEPS
Login to your dashboard and click on the link for Correction of Course of Study;
Select Course of Study; and
Click SUBMIT

You can read more from here
https://freshinfo.com.ng/how-to-correct-date-of-birth-and-wrong-course/