Reza Mahallati's Civil Surveying Review Workshop 2010 vs 2020

[nart]

I have an old version (2010). Is it worth it to purchase Reza Mahallati's Civil Surveying Review Workshop 2020? How much of a difference between the two?

Thanks

 

[WaterEng]

I have an old version (2010). Is it worth it to purchase Reza Mahallati's Civil Surveying Review Workshop 2020? How much of a difference between the two?

Thanks

I used a 2017 version and can say that some material didn't pertain to the current exam but a large portion did. I personally would recommend trying to get the most recent version as possible.