In 1905, the movement in Bengal was indeed marked by mass mobilization through the organization of ғamitis, which were large gatherings of people for social and political activities. This is stated in option 1.

However, option 2 is incorrect because there is no mention of labor strikes being part of the movement in Bengal in 1905.

Option 3 is correct as the movement advocated a constructive program of self-help or "tmashakti." This program aimed to foster self-reliance and empowerment among the people.

Option 4 is correct because in the sphere of education, national schools were indeed established as part of the movement. These schools aimed to promote nationalist ideals and foster a national consciousness among the students.

In conclusion, the correct answer is option 4.