For 1.2, not sure about 1.3x versions at this point.
Scoring appears to be a cumulative stat. So basically you want to get your stats high as early as possible. For me, the majority of my points come from military and economy. Out of ~165K points in my last game, I think they where each about 50K points.
On scoring points from the economy...
1) This seems to be based on your income, not your wealth.
2) There is a significant penalty on your income, if your cash balance is over 20K at the end of a turn. So, make sure you spend your cash down to under 20K at the end of each turn.
3) Mind Control Center was buggy and actually added 100% to your economy, instead of helping alien defections. In my opinion, this bug makes evil the most valuable race for points (over neutral and NLC)
On scoring points from the military...
1) Spend that extra cash on ships!
2) I think a spin control center might actually help for your military score as well as how your enemies see you. Have not confirmed that.
3) If you reach a point where you are building ships that you will not use in offensive actions, build them without engines. You can squeeze more weapons on them and they are worth more points for the production value...Drop the shields as well, if they will not go into battle.
In general…
1) Abundant everything. I think the game is easier to conquer, also you have more planets.
2) As large of a map as you can stand…Increasing planet count again.
3) Difficulty level is a minor bonus, but it is a bonus.
4) As fast of tech as you can stand. The faster the tech, the larger your absolute economy, military, etc.
5) Fully developing galactic resources is top priority.
6) Fiddle with your racial stats and political bonuses. Drath are the best. Clear the counters and put points into areas that do not receive native bonuses. I prefer Pop growth, Economy and Social production for racial and Social/Military production for political.
7) It’s a misnomer that population improves your score. It only seems to improve it as it affects your economy. One farm and then head off into either more industrial sectors, stock markets or cultural centers…
8) You can also improve your score by "playing" past the end of the game in most cases. but this is somewhat boring...
I’m sure there is more, but that all I can think of, off the top of my head.