Ok. I get it. Sister if you want your vehicle by August / September, 2019; you have got 02 options:
Either you book by December 2018 or January 2019 to get your vehicle by that time.
Or (Although not a good suggestion and advise):
You directly go to the show room in August / September, 2019 and take on spot and ready delivery of latest / current model Altis 1.6 by paying some premium.
Agar aap November 2019 mein booking karwayein gee to car aapko June-July, 2020 takk milay gee and may be, tub takk 12 generation Corolla Sedan launch ho gye ho.
I hope, it helps. Thank you.