(1) Before he started out / (2) he had collected all the / (3) informations about the country / (4) he was going to visit.
Explanation : Information is a collective noun which means items of knowledge. Collective nouns do not take a plural form. Hence, informations is incorrect.
(1) The first lesson I got / (2) in my military days was that / (3) one should love his country / (4) better than anything else.
Explanation : 'One' should be followed by one or one's only and not by 'his' "...........one should love one's country.........."
(1) I ordered for a cup of tea / (2) but the bearer / (3) brought it only / (4) at the end of the tea-session.
Explanation : 'Ordered' means 'called for', therefore, 'ordered for' is not correct. No preposition is required after 'ordered'.
(1) Hardly I have finished reading / (2) when my sister / (3) snatched the book / (4) from me.