1) it is not necessary for you to change your name in class 10th , 12th , B Tech certificates ,
2) once you have changed name through gazette notification and is reflected in your identity documents it should suffice .
3)CBSE guidelines
The change in the name of
candidate/Father/mother/guardian once entered in the
Board’s record at any stage while studying in Class IX, X,
XI, XII or thereafter, within a period of ten years from the
date of issue such document shall be considered on written
request of the candidate ( not minor)father/mother
guardian duly forwarded by the Head of the Institution
supported by the following documents:
a.) Original copy of two newspapers( daily
English/Hindi newspaper at National level and
daily newspaper in a vernacular language
circulated in the locality), in which desired
change has been publishes;
b.) Original Affidavit duly sworn before the Judicial
Magistrate, First Class/ Metropolitan
Magistrate/Executive Magistrate/Sub Divisional
Magistrate;
c.) Original copy of Publication in Government
Gazette;
d.) Payment of prescribed fee
e.) True copy of admission form filled in by the
parents duly updated as per Gazette Notification
of desired change and duly attested by the Head
of the concerned institution.
f.) True copy of school leaving certificate of the
previous school submitted by the
parent/candidate at the time of admission and
updated as per gazette Notification of desired
change, duly attested by the Head of the
concerned institution.
g.) True copy of the page of admission and
withdrawal register of the school where the entry
has been made in respect of candidate showing
updation as per Gazette Notification of desired
change duly attested by the Head of the
concerned institution.