Vamos a comparar los siguientes ejercicios en el video:

FIRST

ADVANCED

VIDEO EXPLICANDO LAS DIFERENCIAS PRINCIPALES

VOCABULARY

B2: commonly used in everyday language – informal
Relative: which, that, where, who                             
Phrasal verbs: look after, give up, put off, call of
  Word + preposition: agree with ,  believe in, depend on, good at, afraid of, interested of
Linkers: although, even though, despite, in spite of, according to
Purpose: so that
Condition: if, unless
Cause and effect: because, so, since

C1: more commonly used in formal situations
Relative: whose, whereby                                                      
Phrasal verbs: bring about, take on, hold up, put forward, turn down
Fixed expressions: take into account, play a role in, bear in mind, pose a threat
Word + preposition
Linkers: whereas, nevertheless, moreover,
Purpose: in order to, for the purpose of
Conditions: provided that, as long as
Cause and effect: consequently, due to, as a result
Addition: not only
Word + preposition: conform to, refrain from, boast about, expertise in, need for, inclined to opposed to