If I had spare money at the end of the month I definitely would love to go sightseeing. If I had more money, I would like to buy some math books, book more lessons in Italki and also buy new headphones.

If I had spare money at the end of the month, I would go sightseeing. [type 2 conditional - unreal present/future situation] If I had more money, I would buy some math books, [I would] book more lessons on Italki, and [I would] also buy new headphones. [type 2 conditional]

If I had spare money at the end of the month I would love to go sightseeing. If I had more money, I would like to buy some math books, more lessons on Italki and new headphones.

I had spare money at the end of the month I definitely would love to go sightseeing. If I had more money I would like to buy some math books, booked more lessons in Italki and also to buy new headphones. We don't see the questions, so I'm guessing... If I had spare money ..., I would have gone sightseeing. If I had more money, I would have bought books and headphones, and also have booked a package of lessons here on iTalki.