1) Drop outs

2) Medium of education (for e.g our education system is primarily in English while majority may not understand, speak or write English)

3) More inclination towards religious education

4) Lack of facilities (that's usually a very general argument

5) Small proportion of budget allocation to education sector

6) No proper training - as regards to teachers and professors

7) economic hurdles

8) gender discrimination in pk education system

9) poverty

i hope you find them useful