:wa:
I usually set targets/task according to priority and also assess how much time i might/may need to complete a set task (all in my head). If i don't know how much time a certian task, for example memorising a chapter of a book will take, i usually carry out a preliminary test by timing myself first. All this information is then fed-back to my brain.
It's a little weird but saves a lot of time and keeps me on track. :hmm: