tactics trainer new approach

I want to try a new approach in tactic trainer.
I will try 20 tactics trainer exercises.
some I get and some I fail nothing new there.
but the new thing:
don't look at the solution.
the next seven days I will keep trying the 20 exercises till I can solve them in less 10 seconds all 20 exercises. - I will never look at the solution.
If I don't get the solution I will extent to more days.- till I get it.
that means I have to understand all 20 before moving on. this is a bit more time consuming but I think I learn more than just moving on and on.
maybe you can use this approach.

I came up with a new approach too :)

I do tactics at chesstempo where you can set the difficulty. I will set it to hard and be happy if I miss one because I learn something that way. I used to do mid or low difficult and went for the rating.