By Mohammad Yunus Yawar and Charlotte Greenfield KABUL (Reuters) – Raihana, 19, wanted to be a doctor, studying until midnight in recent weeks for Afghanistan’s university entrance exam, a chance for women to advance their education even as they face growing restrictions from the Taliban government. Her diligent preparation ended on Friday when a suicide attacker detonated his explosives during a practice exam in the girls’ section of a packed room at Kaaj Education Institute, a private tutoring centre in the capital Kabul. Raihana’s father, a shopkeeper, rushed her to hospital but she did not…