Hope you do OK.
Those formulas?
The only ones you MAY need to be aware of are the V/I = R and the P/I = V, where:
V = volts
I = current
R = resistance
P = power (watts)
Study the 'formula triangles' and try to remember the sequnce of letters.
I tell my students to recall the first three letters of VIRUS and PIVOT and place those in the appropriate triangle depending on what you are trying to calculate - see a Foundation booklet for more on this.
None of the questions will be difficult - the last one I saw simply asked which formula would be used, no calculations required, the answer being in the formula triangle.
If you do get a maths question, it is unlikely to be any more difficult than this:
12 volts across 6 ohms, what is the current?
For this you use the VIR triangle.
You want to know the 'I' (current) so by covering the wanted symbol with your finger, leaves the V on the top and the R under the divide line.
This means V divided by R, or 12 divided by 6.
If you can divide 12 by 6 you can answer any questions on this as they won't be any more difficult. Be aware that finding some values my require finding the answer first using the VIR triangle and then applying it to the PIV triangle - a two step calculation - but I've never seen that crop up in a question.
Good luck.
last Friday night...
