I think,
I said with some information.

What kind of information?!
Long-term research, interest in mathematics, and at least 5+ years of experience.
No one says to anyone, "I couldn't eat it. Here you go, eat it."
You mean you can reduce keyspace of a random search process?
5 years experience is not bad

try harder if you think you can skip some ranges in random search

) The only thing that can help him is giving him finished ranges