Possible to Prepare for E1,P1,F1 and Ocs in 91 days? Till nov 5th?

Today-01/08/2019
will Complete Ba4 on 10/08/2019
E1 prepare and exam till 30th aug 2019 – 20days
P1 prepare and exam till 22th sept 2019- 23 days
F1 prepare and exam till 15th oct 2019- 23 days
22nd oct is last day for Case study scheduling and pre seen material at 20th sept
Ocs prepare and exam till 7th Nov 2019- 14 Days
Will this schedule be possible or is it not realistic ?
Anyone who has passed or attempted Ocs Please let me know thanks a lot.

note- i have studied for my Intermediate charted accountant exams so i am good with conceptual knowledge for 60-70% of costing & accountancy topics.

OR
Should i wait for next month (sept 2019 as my kaplan bookseller said me) for 2019 Syllabus books and attempt Ocs in Feb 2020?
Will it affect my Ocs if i gave E1 in old syllabus? and later studied the changes for Ocs?

Point is 2nd option will Delay my 2nd(management level) Lev till Aug 2020 and Stratigic lev till Feb 2021.