Use APKPure App
Get অংক গাইড HSC math solution old version APK for Android
HSC Math Solution will provide you the solution of ketab uddin and okkhorpotro
HSC Math Solution will provide you the solution of ketab uddin 1st and 2nd paper problems, okkhorpotro 1st and 2nd paper problems.
As the app is lite in size you can use it any device.
After loading the pdfs, you can use it in offline also.