hello David ....
for the first question, i guess ya you should do any thing to get more points, just look at your evaluation test and see which part of it you can work on it and get more points, forexample am taking frensh courses now, i hope it will give me some more points when i update my profile, coz am also less than 67 points.
for your martial state, no dont inform them now, leave it till they ask you about the update letter, coz you need to send new application, and there you will let them know that your divorced, coz anyway they are not assessing your application now so its useless to infrom them now about your divorcing or separation.
have a good luck.