12 Months: January, February, March, April, May, June, July, August, September, October, November and December
12 Trains: Ashwagandha, Methika, Amalaki, Draksha, Chandan, Sunthi, Haridra, Haritaki, Lavanga, Ajmoda, Putiha and Rasona

1) Amalaki, Haridra and Lavanga will be launched in the months having the same first alphabet. So these trains will be launched in January, June and July in no order.

2) Ashwagandha, Sunthi and Haritaki will be launched in the given order and in the months having the same number of alphabets.
Of all the months, February, November and December are the only three which has same number of alphabets. Hence, Ashwagandha will be launched in the month of February, Sunthi in November while Haritaki in December.

3) Methika will be launched immediately before Haridra but after Draksha.
This states that Methika will be launched in the month of May immediately before Haridra, which will be launched in the month of June. And Draksha can be launched either in the month of March or April.

4) Putiha will be launched in the month immediately after the month in which Lavanga will be launched.
So, Lavanga has to be launched in the month of July, so that Putiha can be launched in the next month i.e. August.

5) Chandan and Rasona will be launched after Lavanga is launched.
So, Chandan and Rasona can be launched in the months of September or October.

6) There are five months (excluding both their launch months) between the months in which Chandan and Ajmoda will be launched.
Therefore, Ajmoda can be launched either in the month of March or April.

If there are 4 months between Ajmoda and Rasona, then Draksha will be launched in the month of
March.