You can not attend Schengen visa interview earlier than 3 months before the actual entry into Schengen zone.
Interview will be conducted at the consulate which is taking care of your jurisdiction.
The date and time of the interview is determined by the availability.
If there is no interview spots available during your preferred date and time the next available spot will be booked.
Note: Persons applying with the passports of the countries listed below may experience extended processing timing after the interview: Afghanistan, Algeria, Bangladesh, Cameroon, Congo Democratic Republic, Central African Republic, Chad, Egypt, Iran, Iraq, Jordan, Kenya, North Korea, Lebanon, Libya, Mali, Mauritania, Morocco, Niger, Nigeria, Pakistan, Rwanda, Saudi Arabia, Somalia, South Sudan, Sri Lanka, Sudan, Syria, Tunisia, Uzbekistan, Vietnam, Yemen along with Palestinians, refugees and stateless persons.