I read the Qur'an daily in the morning for 30 mins, noon 10 mins and night time for 30 mins. Now because of that I can not read the important surahs. For example, in the morning I need to read Surah Al-Rahman, at night Surah Mulk. Please guide me as to how I can combine both objectives everyday in my life.
Firstly, may Allah reward your efforts for having committed yourself to the recitation of the holy Qur'an on a daily basis. More you recite from it, more your iman and spiritual wellbeing will increase insh'Allah. If you want to keep reading sura al-Rahman and sura al-Mulk every day, just consider that their recitation may take no more than fifteen minutes, even less, if you have them properly memorized. Take also in consideration to memorize as much of the Qur'an as you can because it has great benefits and makes your recitation smoother and faster. In this way you may be able to easily fit the recital of the two surahs to the daily recitation of Qur'an in your devotional program. Another option may be to recite sura-Rahman as a ta'qeeb (supererogatory act performed after salat) after salat al-Fajr and sura al-Mulk after salat al-Isha.
With prayers for your success.