Can anyone suggest how can we differentiate the ICO rating website are worthy, that is better to take it as a reference website to understand and learn more?
The sad fact is most of them are paid to give good ratings to these ICOs. Don't trust any of them and have your own basis as for checking what ICO to invest. But it's better if you'll just stop investing to these ICOs.
Every reference can be paid, good or bad review so if its for your own decision making be cautious for every possibility. Start looking for other legit investment vehicle instead of ICOs now. They are the same in schemes and ideas nowadays.