Question

mode of preservation raw mango and tamarind

Answer 1

store it in rice bags .

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Answer 2

There is a technique in which the pulp of mango is taken out and poured on specific mats. Then it is allowed to dry under the sun and after that the dried pulp is scraped off the mat and stored. It will stay good like this for many months.
Another method is to put unripe mangoes in salt water and eat it like that when needed.
Tamarind is dried under the sun and stored in large pots as per the quantity. It can last for a long time.