I was incited to deposit in the job offer of the platform, where spread is very high

I was invited to work in the company in March. The company carried out one-week training first under the cover of recruiting financial analysts. It asked you to take an exam by depositing in a real account, and said could join the company after passing the exam!
If I deposited in 3,000 US dollars in the exam, I could get a basic salary of 6,000 and gain a profit of 20% by managing an account with a deposit of 10,000 US dollars. If the deposit was 6,000 US dollars, a basic salary was up to 10,000 and 30% profits would be granted by managing an account with a deposit of 30,000 US dollars; If the deposit was 10,000 US dollars, a basic salary was up to 15,000 and 40% profits would be granted by managing an account with a deposit of 50,000 US dollars!
And the company does not have the qualification to operate forex business! It also required us to sign the so-called assessment contract, saying that if I dropped the exam in the middle, I couldn’t withdraw the money. They told me the spread was very small, and tries to cover the facts so as to incited me to deposit money on the platform! So I was deceived and the money was lost.