If you invest in just one resource, this one is the one to go for! 
How to approach the Diálogo
A comprehensive selection of grammar and vocabulary points covered in Diálogos over the last 10+ years.
 
Ideal for 6th year revision between February and June
 
Also includes a Practice section WITH solutions
 
Grammar revised and explained, with samples:
To have just done something
Conditional
Present perfect
TENER expressions
To have done something for X amount of time
Reflexive verbs
Not only X but also Y
After/Before
Subjunctive use
Ser/Estar
Gustar-type verbs
Time
'Lo' 
Negation
Common spelling errors to avoid
 
TEACHERS: correction section can be photocopied or projected on board for class corrections
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A one-stop resource to revise the Diálogo!