Hello Mani Shankar Rai,
You can refer to the following article https://edugorilla.com/allen-coaching-fee-structure-admission-procedure/ for details about the admission fees. To know the exact start date, you can contact the respective location of the allen insititue given in the above mentioned article.
All the best for your future endeavours!
I studied at Allen last year, in the batch of 2016-2017 in Bangalore and the fees structure goes upto 1,20,000 for an year. You can gain scholarship upto 90% where you just have to pay 20,000 and you can gain scholarships only after you take an entrance exam. If your score in the given exam is say, 150/300 then you get up to 30% scholarship. So I suggest you to take the exam. As per coaching, it’s pretty good.