update grade edit

[yap-zong-xin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 6.25000% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 65.17%. Comparing base (49593b1) to head (3f5bcbc).

Files	Patch %	Lines
.../seedu/address/logic/parser/EditCommandParser.java	0.00%	10 Missing ⚠️
...java/seedu/address/logic/commands/EditCommand.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #62      +/-   ##
============================================
+ Coverage     65.09%   65.17%   +0.08%     
  Complexity      423      423              
============================================
  Files            77       76       -1     
  Lines          1593     1591       -2     
  Branches        166      167       +1     
============================================
  Hits           1037     1037              
+ Misses          518      516       -2     
  Partials         38       38              

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