Seek help while you're studying something difficult :

اللَّهُمَّ لاَ سَهْلاً إِلّاَ مَا جَعَلّتَهٌ سَهْلاً وَأَنّتَ تَجّعَلَ الحَزَنَ إِذَا شِئتَ سَهْلاً

Allâhumma lâ sahla illâ mâ ja‘altahu sahlâ wa anta taj‘alu al-hazana idhâ shi’ta sahlâ.

Oh Allah! Nothing is easy except what You have made easy. If You wish, You can make the difficult easy