If anyone recites Aayatul Kursi (2:255) once after every prayer, Allah will protect him against the mischief of evil men and Jinn. In fact, according to a Hadith, Satan acknowledged his inability to harm a person who recites Aayatul Kursi continuously.
If the last two Surah of the Holy Quraan, viz Suratul-Falaq (113) and Suratul-Naas (114) are recited for protection against sickness, sorcery (Jaadoo), Nazar etc. one should find it very beneficial. If anyone recites them before going to his bed, he will afford security and protection against all calamities.