In a certain code language, ‘RAJESH’ is written as ‘IUHNFX’, and ‘GARIMA’ is written as ‘BOLVFM’. How will ‘RITIKA’ be written in that language?

Let's inspect the coding structure of RAJESH → IUHNFX:
Let's look at the cross-pattern or opposites:

R's opposite is I.

A's opposite is Z (not U).
Let's check pairs or reverse order:

Last letter H+1=I

S+2=U

E+3=H

J+4=N

A+5=F

R+6=X

Wow! The pattern is to reverse the word and add +1,+2,+3,+4,+5,+6 to the letters:
Let's verify with GARIMA → reverse is AMIRAG:

A+1=B

M+2=O

I+3=L

R+4=V

A+5=F

G+6=M
This gives BOLVFM, which matches perfectly!

Now let's apply this to RITIKA. First, reverse the word: AKITIR.

A+1=B

K+2=M

I+3=L

T+4=X

I+5=N

R+6=X

This gives BMLXNX.