It is highly recommended and I did it personally to attend a 5 day course on TOGAF training course from authorized centers. Training sessions touch base all topics & gives you baseline for preparation.
But hey don’t just stop here. You need to a do a many more activities
- Read TOGAF V9.1 book - as many times you can
- Attempt mock test repeatedly - as many times you can
- Prepare pick up points
For awareness, I myself creaed bunch of pick up points as ready reference & would be happy to share very soon. For sharing purpose they are under revision & would be shared very soon for FREE.
Few important links
General - http://www.opengroup.org/subjectareas/enterprise/togaf </br>