You will get 1 to 25 points on answering a question and when your answers and questions are up-voted and wishlisted by other members. The number of points depends on the quality and relevance of your answer.
Yes, now they have changed the point system that you will get in forums. But yes it also depend on the content and length of the response that you are giving in the forum for the respective questions. Improvise the quality of your answers then based out of that you can easily achieve the more credits for redeemptions. Happy travelling. Keep posting your experiences.