from celery import chain

task_chain = chain(
      task_1.s(),
      task_2.s(),
      task_3.s(),
  )

succeed_callback = [
    task_4.s(),
    task_5.s(),
]

failed_callback = [
    task_6.s(),
    task_7.s(),
]

task_chain.apply_async(
    ...
    link=succeed_callback,
    link_error=failed_callback
)