Another site:
 AllTODAY'S STATSTop 200 most popular tests to learn English...
 1) Passive voice (webmaster) 11
 2) Emphatic use of do (bridg) 9
 3) A/AN (webmaster) 7
 4) Present simple (webmaster) 6
 5) Placement test : grammar for beginners (lucile83) 6
 6) What time is it? (webmaster) 5
 7) Article 'the' / nothing (matrixhamdi) 5
 8) Comparatives (webmaster) 4
 9) 'Almost similar words' part 2 (here4u) 4
 10) CAN / MUST (webmaster) 3
 11) Must or Have to? (woodyrun) 3
 12) Problem - Issue - Trouble (here4u) 3
 13) Present continuous (webmaster) 2
 14) Auxiliary BE (webmaster) 2
 15) Numbers > 100 (webmaster) 2
 16) Superlatives (webmaster) 2
 17) Modals (tinou) 2
 18) Preterite (bridg) 2
 19) Which modal and when ? (bridg) 2
 20) Adjectives (lucile83) 2
 21) Past tense in the interrogative form (woodyrun) 2
 22) Present simple (lucile83) 2
 23) Hypothesis (webmaster) 2
 24) Questions : how to ask them (lucile83) 2
 25) Passive form (lucile83) 2
 26) Must or mustn't (laure95) 2
 27) Narration tenses (mylaw) 2
 28) Could/Couldn't (laure95) 2
 29) Article A or AN (lucile83) 2
 30) Comparison (komiks) 2
 31) Present simple (komiks) 2
 32) The more ... the fewer ... (here4u) 2
 33) Should ( Ought to) (here4u) 2
 34) The more... the less (easy) (here4u) 2
 35) There are, there will be, there were (anijul) 2
 36) Reciprocal Pronouns (zilazila) 2
 37) 'Almost similar words': part 1. (here4u) 2
 38) Irregular Verbs (I) (webmaster) 1
 39) Preterite: simple or continuous? (webmaster) 1
 40) Present continuous (webmaster) 1
 41) THE/ A / AN / nothing (webmaster) 1
 42) Present BE + Ving (bridg) 1
 43) Silent letters I (webmaster) 1
 44) How to pronounce the final -ED? (past simple) (webmaster) 1
 45)  (bridg) 1
 46) Asking questions (webmaster) 1
 47) Comparatives / Superlatives (webmaster) 1
 48) 2 Preterites (webmaster) 1
 49) Present perfect simple (bridg) 1
 50) Slang (webmaster) 1
 51) 'The' or nothing? (webmaster) 1
 52) Conditional (webmaster) 1
 53) Alone by Edgar Allan Poe (webmaster) 1
 54) Preterite continuous (BE + -ING) (webmaster) 1
 55) Tenses (bridg) 1
 56) Much, many, little and few (felin) 1
 57) Short placement test (webmaster) 1
 58) Comparative and superlative forms (bridg) 1
 59)  (webmaster) 1
 60) Modals (webmaster) 1
 61) Right tenses and words (nick27) 1
 62) Countable nouns with a/an and some (lucile83) 1
 63)  (bridg) 1
 64)  (bridg) 1
 65) Home/ house (lucile83) 1
 66)  (webmaster) 1
 67)  (webmaster) 1
 68) Directions (webmaster) 1
 69)  (webmaster) 1
 70)  (webmaster) 1
 71) Used to (bridg) 1
 72) Future- be going to or will (bridg) 1
 73) Modal verbs (woodyrun) 1
 74) As... Like... As if/ as though... (here4u) 1
 75) List of 200 irregular verbs and audio (bridg) 1
 76) About / about to (lucile83) 1
 77) Question tags (matrixhamdi) 1
 78) Past tenses (matrixhamdi) 1
 79) Passive voice (costo) 1
 80) Hypothetical sentences: tenses (lucile83) 1
 81) At the station - Taking the train (bridg) 1
 82) Article The or not ? (hidalgo) 1
 83) Reported speech (sreedhar) 1
 84) Habits and used to (lucile83) 1
 85) Mixed Conditionals (greg100) 1
 86) Coordinating Conjunctions (greg100) 1
 87) Daily expressions (lucile83) 1
 88) Borrow / Lend / Loan (greg100) 1
 89) Slang (nick) 1
 90) Comparative of superiority (lemagemasque) 1
 91) Adverbs : formation (valdyeuse) 1
 92) Past participle – Irregular Verbs (benstrong) 1
 93) Welcoming guests in a hotel (webmaster) 1
 94) Understanding classroom rules at school and interacting (webmaster) 1
 95) Test de niveau anglais (webmaster) 0
 96) Two presents: simple and continuous (webmaster) 0
 97) Two presents: present continuous, present simple (webmaster) 0
 98) Present perfect simple (webmaster) 0
 99) Preterite (webmaster) 0
 100) Idioms: birds (webmaster) 0
 101) Pluperfect (webmaster) 0
 102) Idioms: animals (I) (webmaster) 0
 103) Modals (bridg) 0
 104) Present continuous (lucile83) 0
 105) Idioms; human body (webmaster) 0
 106) Idioms: Clothes I (webmaster) 0
 107) Idioms: colors (webmaster) 0
 108) Idioms: doctor (webmaster) 0
 109) Idioms: food (webmaster) 0
 110) Present simple (webmaster) 0
 111) Numbers (webmaster) 0
 112) Height (webmaster) 0
 113) Genitive (webmaster) 0
 114) Preterite (webmaster) 0
 115) Reading comprehension: islands for sale (webmaster) 0
 116) Future (webmaster) 0
 117) Reading comprehension: no supply? no school! (webmaster) 0
 118) Fractions and percentages (webmaster) 0
 119) Pronunciation: Mute letters (webmaster) 0
 120) Bad for teeth, good for dentists. (webmaster) 0
 121) Idioms: the head I (webmaster) 0
 122) Uncountable nouns (webmaster) 0
 123) Some, any, no, enough, too/too much/too many (webmaster) 0
 124) -'s / -s' / the ... of ... (bridg) 0
 125) Virus dials 911 (webmaster) 0
 126) Spider-Man (webmaster) 0
 127) Plural of words (lucile83) 0
 128) Animals (webmaster) 0
 129) Numbers (webmaster) 0
 130) Feminine forms of nouns (webmaster) 0
 131) A/an/Ø (bridg) 0
 132) Animals (webmaster) 0
 133) To be - Present (bridg) 0
 134) Audio Comprehension: Northern Ireland (webmaster) 0
 135) 3-year-old hits the road in search of parents (webmaster) 0
 136) Rats Move to Beverly Hills (webmaster) 0
 137) Question Tags (bridg) 0
 138) Greece Boosts Olympic Security (webmaster) 0
 139) Articles a/an/the/0 (bridg) 0
 140) Compréhension écrite : Pesticide causes devastating explosio (webmaster) 0
 141) Basketball (webmaster) 0
 142) 20th July 1969 (webmaster) 0
 143) Fremont police offering free night in new prison (webmaster) 0
 144) Animals (webmaster) 0
 145) Global ride hit by bike theft (webmaster) 0
 146) International survey (webmaster) 0
 147) Salem School shut down after students get rashes a (webmaster) 0
 148) Students use email to cheat during 'e-Commerce' ex (webmaster) 0
 149) West Palm doctor pleads guilty in overdose (webmaster) 0
 150) Putting Boxes Outside Can Be an Invitation for Hol (webmaster) 0
 151) Man in China sues after ads delay movie by four minutes (webmaster) 0
 152) A New Titanic? (webmaster) 0
 153) English idioms: Food II (webmaster) 0
 154) A crazy man steals rings for Claudia Schiffer (webmaster) 0
 155) Traffic deaths (webmaster) 0
 156) Super bowl (webmaster) 0
 157) Initials / Abbreviations / Acronyms 1 (webmaster) 0
 158) The end of supermarket queues (webmaster) 0
 159) Question Tags: Lesson (webmaster) 0
 160) Pluperfect (webmaster) 0
 161) Past simple (video) (lucile83) 0
 162) This / That / These / Those (webmaster) 0
 163) Superlative Adjectives (bridg) 0
 164) Housework video (lucile83) 0
 165) Frequency adverbs (webmaster) 0
 166) Scotland (webmaster) 0
 167) First commercial moon mission approved (webmaster) 0
 168) What time is it? (bridg) 0
 169)  (bridg) 0
 170) How in different expressions (bridg) 0
 171) Compound words (webmaster) 0
 172)  (bridg) 0
 173) Writing letters (bridg) 0
 174) Writing letters (bridg) 0
 175) Road to the White House (webmaster) 0
 176) George Bush (webmaster) 0
 177) John Kerry (webmaster) 0
 178) Ralph Nader (webmaster) 0
 179) George W Bush (webmaster) 0
 180)  (bridg) 0
 181) Modals (bridg) 0
 182) Make, Have, Let (bridg) 0
 183) Birds II (Idioms) (webmaster) 0
 184) Colors: idioms II (webmaster) 0
 185) Acronyms II (webmaster) 0
 186)  (bridg) 0
 187)  (bridg) 0
 188) General test-End of high school / Beginning of university (webmaster) 0
 189) General Test II / End of high school / Beginning of universi (webmaster) 0
 190)  (bridg) 0
 191) To run and adds (bridg) 0
 192)  (bridg) 0
 193) Ask the question (webmaster) 0
 194) Remembering Ray Charles (webmaster) 0
 195)  (bridg) 0
 196) Graffiti (bridg) 0
 197)  (bridg) 0
 198) Emails (bridg) 0
 199) Initials / Acronyms III (webmaster) 0
 200)  (bridg) 0
