I know I'm pretty new here, but as someone who also suffers from ADD, I felt I might chime in.
First and foremost, medication helps - and this coming from the kind of person that doesn't take his meds everyday. I don't really need to, for the most part. Daily life I handle just fine. But the fact of the matter is that whether you have a learning disability,
or you have add,
or are just an average joe,
medication can do wonders for concentration and attention span.
I've also heard that both tea and dark chocolate
are excellent for boosting brain power.
If you're having trouble with LG, what I did to get my time down was time myself on individual games. 35 minutes / 4 games = 8 minutes 40 seconds per game. Try to do one game, any game, in 8 minutes. Then 7:45. Then 7:30, so on and so forth. The whole section is designed to not give you enough time to complete it, so the trick is to get really fast as easy games like pure sequencing so you have time for the harder ones later.