Question

please explain all the rules which are used in editing and omission​

Answer 1

Actually you need to have accuracy at grammar then you can edit the paragraphs

Answer 2

Editing

it should be the same as it us in the key eventhough the alternative is right✔they won't give marks

Understand the tense

read it after editing twice

Omission

Understand the tense

read after finding the missing word

if u don't know mark X

present with 3 tabular columns of before missing and after

Hope this HELPS u