simple way
1. PLEASE BACKUP ALL YOUR DATA
2. and then restart your macbook and press OPTION button when restarting macbook
3. please select DISK UTILITY
4. select your SSD and then klik "ERASE"
5. the last action, select "PARTITION" and create your partition.
6. if done, please re-install your MAC OS and other program
you will get fresh macbook... trust me