Merge pull request #2486 from suryanarayanakb/release-6.6.3.a1

FE default image broken issue fixed
Grades and standards clear implemented
Merge pull request #2487 from ssushma/release-6.6.3.a1

Grades and standards clear implemented
Merge remote-tracking branch 'upstream/release-6.6.3.a1' into release-6.6.3.a1