Go to hamstudy.com also ham radio prep.com they are what i used. I don't like videos so I just scrolled down and read everything. Then do quiz on each section after you think you know it a little, go to the end, and take quiz. Continue to take quiz untill you get 85% most times. It remembers what you had wrong and brings it up again, and it keeps track of your scores. The on line test is exactly what you have been taking, 35 questions. You can miss 8? It is very relaxed. There are not many math problems maybe 3. Get a notebook and write down the ones you have problems with. Write down definitions of APRS WMR, SwR psk, etc. Also the pie chart they changed P power. To E 8n the chart, don't know why. As to the pie chart, write down under each other the description such as
P=POWER WATTS =AMPS DC
E=voltage volts
I= intensity current amps
Good luck. Double check all I have written to make sure I did not make a mistake.