We don't know the dates of the official exams in June but I can tell you when we can do the practice tests in May:
Alterno Mondays & Wednesdays:
20th May (Monday): Reading & Writing
22nd May (Wednesday): Listening & oral practice
27th May (Monday): Oral practice (presentations)
29th May (Wednesday): Marks
Alterno Tuesdays & Thursdays:
16th May (Thursday): Reading & Writing
21st May (Tuesday): Listening & orals
23rd May (Thursday): Oral practice (presentations)
28th May (Tuesday): Marks
Diario:
20th May (Monday): Reading
21st May (Tuesday): Writing
22nd May (Wednesday): Listening
23rd May (Thursday): Oral practice
27th May (Monday): Oral practice (presentations)
28th May (Tuesday): Oral practice (presentations)
29th May (Wednesday): Marks