So complicated was the procedure that many applicants sought assistance.
No error. This is a correct formal inversion with so + adjective.
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Little did he know that the decision would change his career.
No error. Initial little meaning “hardly at all” can trigger inversion.
At no time did the witness admit that the statement was false.
No error. The negative expression at no time correctly triggers inversion.
Only then did she realise the seriousness of the mistake.
No error. Only then at the beginning correctly triggers inversion.
Only after checking the records did the officer sign the document.
No error. Initial only after triggers inversion in the main clause.
Not until the results were announced did the candidates leave the hall.
No error. When a negative time expression begins a sentence, the main clause takes subject–auxiliary inversion.
The candidate has extensive knowledge of constitutional law.
No error. Knowledge of a subject is the correct expression.
The research team made substantial progress despite limited resources.
No error. Make progress is a standard expression.
The teacher provided detailed feedback on every answer.
No error. Feedback is correctly used as an uncountable noun.
The laboratory purchased several new equipments last month.
Equipment is uncountable and does not normally have a plural form. Correct: The laboratory purchased several new pieces of equipment last month.
Everyone of the selected candidates must report by nine o'clock.
Everyone means everybody and is not followed directly by of. Correct: Every one of the selected candidates must report by nine o'clock.
I have not received either of the two documents.
No error. Either of the two documents correctly refers to either member of a pair.
Neither of the two explanations seems convincing.
No error. In formal exam grammar, neither of is treated as singular here, so seems is appropriate.
The revised examination contains fewer questions than the previous version.
No error. Questions is a plural countable noun, so fewer is correct.
The revised procedure requires less paperwork than the previous one.
No error. Paperwork is uncountable, so less is correct.
Only a few candidates were able to solve the final question.
No error. A few correctly modifies the plural countable noun candidates.
The examiner informed the candidates of the revised marking scheme.
No error. Inform someone of something is correct. Inform someone about something is also acceptable.
She assured me that the documents would be ready by Monday.
No error. Assure + person + that-clause is correct.
The officer warned the visitors against entering the prohibited zone.
No error. Warn someone against + gerund means advise someone not to do something.
The committee suggested to revise the evaluation criteria immediately.
Suggest does not normally take a to-infinitive directly. Correct: The committee suggested revising the evaluation criteria immediately.
The department has received much fewer complaints since the new system was introduced.
In standard formal English, far fewer or many fewer is preferable for countable nouns. Correct: The department has received far fewer complaints.…
The revised procedure requires less documents than the earlier system.
Documents is a plural countable noun, so use fewer. Correct: The revised procedure requires fewer documents than the earlier system.
The quality of the imported materials is superior than that of the locally manufactured ones.
Superior takes to, not than. Correct: The quality of the imported materials is superior to that of the locally manufactured ones.
The new procedure is more simpler than the previous one.
Simpler is already comparative. Correct: The new procedure is simpler than the previous one.