I did my NEBOSH IGC, HSE and ISO 45001 last year and I passed all. The center was very supportive and the price was affordable they even have installmental payment options. The center is called SAFEGUARD SAFETY CENTER. They've also started online learning due to the pandemic. I think you should search about them, like I said, they're very supportive and the learning environment is superb besides their tutorial team is made up of both indigenous and expatriate tutor's with wealth of experience in the field.