But I personally prefer to practice each segment/sections in my own then mix together for high-scale and this is correct way.
If you can not redistribute correctly in one ASs as an example, how you expect it's working from other ASs as well?
So, you should practice at first with your system, any parts that be able to simulate ! If you can't do SD-WAN, DNA, ok , then switch to Server to practice this.
But let me inform you and anyone here why most of CCIEs holder do not have at least CCNP or even CCNA practical knowledge , I'll tell you .
Because they're just practicing DUMP and memorize it, If examiner/Lab's questions get changes , they couldn't solve it.
As a result, try to make and solve as many as you can scenario in your simulator(GNS3 , EVE-ng , ...) and not rely on this questions, they are perfect , but for a time that you're fully prepared, no workbooks and no training are remain that you're not practicing them two or three times.