According to your query if you have mis-typed in application, then it can be corrected. Suppose if the same mistake is done in your certificates then you need to change the name. That's a lengthy process. When you submit the SSC MTS application that time you need to submit xerox copy of Qualification Certificates, Proof of Identity (Pan Card, Aadhar Card, Voter ID etc.), Date of Birth Certificate, Passport Size Photographs, Category Certificate for the Reserved, Category Candidates, Proof of Residence. If all your these proof are having the correct name then at the time of verification you can get it changed or else write a letter to the committee about the mistake that's done attaching the documents that you have already given at the time of application. You can change it if your name is correct in original documents.