depends. if you jump from a o level position/o level pay range to a degree level. you will jump more than 20%. For eg, ur current o level position in public sector is $1,400 to $1,800 and the degree position starts at $2,800 to $4,000. Considering ur exp and after u get ur degree,u will jump from $1,800 to $3,000+

As for private sector and sme and same scenario, they will still use ur 1.8 add 10 to 15% max even if the new position u applied for is a degree level and the range is $2,800 to $4,000. Which means u still be getting less than 2.8.

Thus in private sector, ur first job is very impt because it determines ur next job salary.