or can i get analysis of my account
You must have one of the highest Activity numbers for a Jr. Member now. Your account had a large "potential activity". This means you didn't post many messages, but the ones you posted had enough time between them to cover each "14-days Activity period".
Right after the Merit system was introduced, you started posting many posts per day (including crossposting of the same post in different threads), which means your post count and thus Activity went up quickly. You even started
a thread, in which these questions were answered already.
So far my analysis.
In what forums here can one make post to earn merits
Any post can earn merits.
But, if you mainly post in threads where nobody else has earned any merits, it's very unlikely you'll get them there. In that case the whole thread isn't worth any merits, and people post there only for bounties or to increase their post count.
Example:
this thread has 96 posts, but it only has 1 post from
a user who has earned 6 Merit points. Several other people who posted in that thread have 100, 250 or 500 Merit points, but they got them at the introduction, and not based on their post quality.
Note: this doesn't mean you should start posting irrelevant posts in threads/boards with people who have earned many Merits just to earn them.