Whoever search for knowledge, Allah will make the path of jannah easy for him. What kind of knowledge is meant by the word "knowledge"? Will a scientist get prize from Allah who is trying to improve the life of the people of his country through his scientific research?
Knowledge are of two types: Ilm-e-deen and Ilm-e-maash.
1.Ilm-e-deen means religiuos knowledge
2.Ilm-e-maash means knowldge of this world.
You must do jihaad in both to be successful in this world and hereafer.