Cover front and back screens with those sunscreens. Commonly available are silver ones with stick on rubbers. Shades or curtains on all four windows. Never close the windows fully while leaving the car in sun. Just a little opening will allow the built up heat to escape and keep the inside temp in limits.
If you can spend like 30K rs, get 3M crystalline heat rejection tints on all windows, screens. Get the lightest shade, so cops will not bother you. It keeps the cabin temp bearable by rejecting almost half of the heat that comes from outside with sunlight.
A cheaper option is Solar Screen tints. Almost transparent.