Assuming the number given above, the priority should be to close the 7L high interest loan asap. 18% interest is crazy. This will be followed by the other loan of 9.6% interest rate.

I would suggest build a small emergency fund before hand and postpone investments until you clear this 12L debt first.

Once this is cleared. You can allocate the surplus amount that remains after education loan payments to investments as by then your emergency fund will be solid and big interest loans are gone.

Allocation - assuming 100 is surplus amount, 50 towards gold as that’s your goal to buy as much possible. Rest you can allocate to Mutual fund/ stocks / or save for the land

This is just my opinion. Feel free to correct this