A search for names that are similar to Motl Minski returns both Motel Minski and Motek Minski, who I believe are the same student. Motel Minski is listed as born on April 12, 1928, and living at Brunnenstrasse 18/1 and Pfeffergasse 16. Motek Minski is listd as born on April 19, 1923, and living at Pfeffergasse 16/3 and Brunnenstrasse 18. These names, dates of birth, and particularly addresses are very close to one another. When we add in the ghetto note information, the similarities become even clearer: Motek is listed as an Altermieter at Pfeffergasse 16/3 and is noted to have moved to Brunnenstrasse on January 11, 1944. Motel's Brunnenstrasse address is listed in full (street then apartment number), while his Pfeffergasse address only has a street number, a convention which almost always means that the person in question lived at the incomplete address prior to moving to the complete address.
Students in school #5 were born between 1926 and 1934. If Motel's date of birth is correct, then Motel/Motek would have been the right age to attend school #5 in 1941; if Motek's date of birth is correct, he would have been a little too old to attend that school.