how to invest the lingots...
I wasted 25 lingots on a test. It was very difficult. Although I got the certificate I made many mistakes and the test was pretty short...I don´t think it was a good idea to invest in that test...
The test is a good way to track your progress though! I've been talking the test once a month since it was introduced (about to take my fourth in a few days), and it is nice to see actual progress.
I know another user suggested talking the test every 5 levels, and it looks like you are perfectly poised to try this as well.
I don't really use linglots for much, and when you get a good streak going, they accumulate pretty fast, so 25 lingots doesn't feel like a bad investment to me :)
haha I did the same with the certificate thing! I did it and scored 1.88 but the problem is that it faces you with words you haven't learned yet! A good way to invest your lingots is to go to the Lingot Store and buy the 7 day streak thing (costs 5 lingots) and if you get a 7 day streak you get your 5 lingots back and a extra 5 lingots for free!
Agreed, but then you are facing the same question of how to invest those additional 5 lingots! :-)
I buy extra hearts, and I might give them as gifts. You can spend them on bonus skills.