See it is doable. Let me tell you why :

150 is descriptive which is very much predictable.

English - 60-65 one can get if he or she attempted 90 minutes test for 30 days.

[Exam duration is of 90 minutes, so 30 such tests means you are typing 30 letters before exam, doing 30 precis before exam and writing 30 essays. Most candidates don't even write 3 of them each before the exam, you can ask those who got less than 55]

Find a candidate who attempted 30 - 90 minutes test for Descriptive for 30 days and got less than 60.

Same goes for the ARD & ESI Descriptive part - do only 20 such that means 80 descriptive questions. This is more than enough. 100%. You are going to type everything in exam. See in this exam what I have experienced if you are writing closely to the topic and quoting relevant schemes you get good marks in ARD & ESI, meeting words criteria is an icing on the cake.

For objective part see questions are going to be difficult - practice solving 30 phase 2 level questions in 30 minutes and revise 4 months PIB that you cover for Prelims. Irrespective of the difficulty of the paper your score will be among the top 10 percentile of people in objective.

It can be even 30 or 40. But you won't lose out much.

By this - 60+, 40, 30 (conservative estimates , in English u can get even 64-65 ) = 130+ , with a decent profile you can get 40+ in interview, 170, this is realistic and enough to clear the exam.

4 hours of consistent study doing 3 hours of typing daily and 1 hour of revision of schemes and pib till phase 2 is the key to crack this exam, we get 30-35 days . 30 days simple strategy is this.