Correct only FIVE of the given sentences ("looking forward to see you"; "ready to give the test"; "all of them did not respond"; "would not rather go out"; "Our economical situation"; "eating nutritiously on the internet"; "I could not found you"; "brought about by his grandfather").

Corrected sentences

Only five are required; all eight are given. One copy of the paper reads "ready to give the test today", the other omits "today"; the correction is the same.

1. I am looking forward to seeing you on Monday. ("To" in "look forward to" is a preposition, so it is followed by a gerund.)

2. How many students are ready to take the test today? (A candidate takes or sits a test; the examiner gives it.)

3. I contacted my five colleagues, but none of them responded. ("All … did not" wrongly suggests that some did respond; "none" states that no one did.)

4. I am tired and would rather not go out this evening. (The negative follows "rather".)

5. Our economic situation is worsening day by day. (Economic = relating to the economy; economical = thrifty, not wasteful.)

6. On the internet, one can find useful information about eating nutritiously. (As printed, "on the internet" seems to describe where the eating happens.)

7. I could not find you there yesterday. (A modal verb is followed by the base form.)

8. Orphaned in infancy, he was brought up by his grandfather. (Bring up = raise a child; bring about = cause something to happen.)

Tip

Several of these are errors common in Pakistan ("give a test", "economical situation", "all did not"). Read the sentence aloud as a native speaker would and check fixed patterns such as "look forward to + -ing".