Leyzer-
Since we agree that anyone who desires to learn Torah full time is entitled to do so, even if he doesn’t have a good head, let me ask you what DaasYochid asked earlier: If the State forced a certain percent of Chareidim to join the army and leave the Beis Medrash, who will choose who is going to be forced to leave the Beis Medrash? A test cannot be the answer, since as we agreed someone who cannot learn well but really wants to learn is entitled to do so.