USMLE DIT 2015, ok or outdated? Please help :D

[MikeyBee]

Hello!

I am a medical student in Europe and I want to take step 1 next year.

Fortunately, a friend gave me DIT 2015 edition videos+workbook and I really like the way they explain the concepts .
Do you think that DIT 2015 is OK or outdated?

I mean... do the guys who make this tests change the concepts from year to year or the difference is very slightly that even if I learn from an older course like DIT 2015 I will still do ok if I will master the presented topics.

Thank you for reading my post and I appreciate every answer!

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[LyMed]

It's fine. I would, however, get the latest version of First Aid.