You need to locate the college and university in physical proximity to your industrial zones or the tech levels won't grow.
I also saw in another post that high tech specialization (processors and TVs/computers) will suck up all the educated workers, preventing your remaining industry from raising its tech level. This has been a slight problem for me because I can't keep low income workers in my city as property values appreciate.
I also saw in another post that high tech specialization (processors and TVs/computers) will suck up all the educated workers, preventing your remaining industry from raising its tech level. This has been a slight problem for me because I can't keep low income workers in my city as property values appreciate.