Well this can be possible by using the
wplms woocommerce plugin .
It offers you to create many variations of the same course product .
In all you can set 6 kind of variations in the course .
Bronze :
Bronze 99
€ with 1 month product subsctiption duration
Bronze 792€ with subscription of 8 months
silver :
silver 99
€ for 1 month
silver 990 for 10 months
Gold :
Gold 249 for 1 month
Gold 2490 for 10 motnhs .
But putting the restriction for the user to purchase the subscription which is of 1 month to a certain number is not possible .
That means user can purchase the subscription for 1 month of any plan any number of times .