hi,

see bpp course is offered by ignou for students who donot clear the 12th exam but wants a bachelors course, By completing the ignou bpp course you may take admission in bachelors courses offered by ignou for example BA/B. Com/BSW etc. however after completing bpp course you need to get admission in offered bachelors course with in two years, in every year there is two sessions comes for admission process, since you have 4 years passed after completing the bpp exam, you are not eligible to take admission now, again you need to write the bpp exam , then you will be eligible to take admission in bachelors courses.

follow the below link to know more information,

http://ignou.ac.in/upload/programme/B%20BPP%20Prog%20Guide-E.pdf