"1020 MHz Base Clock (is it the same as Core clock)"....Yes
"1085 MHz Boost Clock (how can I test it?)"...........the clock will vary depending on load and temp, this speed is the top end reference speed the card should do without changing anything on a reference card.
"Memory 5400 MHz (effective)"...........the GDDR5 clock is 1350MHz, GDDR5 is quad pumped (DDR3 is double pumped), so 1350 * 4 = 5400
"GPU Core Clock [MHz] 1149.7 (Higher than advertised)"........you likely have a card that is factory over clocked
"GPU Memory Clock [MHz] 1350.0 (lower than advertised)"..... the memory clock will adjust according to load just as the core clock does
Hope this answers some of your questions